AMVM97

Normal run states. idle = standby. Ht = heat running (capacity is a percent, not Ht1/Ht2 stages). CF = continuous fan.

1. 1 Confirm this is not a fault

   On the Amana AMVM97 this readout (idle / Ht / CF) is run status, not a lockout. Write what the display actually shows and whether W/Y/G is present at the IFC.

   Expect: Idle / Ht / CF / stage+CFM words change when you apply and remove the call.

   If fail: If the word never changes on a real call, the call is not reaching this IFC.

   If pass: The board is alive. Diagnose the comfort complaint, not this code.

2. 2 Prove the call at the board

   Measure R to W / Y / G at the Amana AMVM97 IFC, not at the thermostat. Communicating plates need the data pair and a live indoor address — 24 V on W is not the test.

   Expect: Do not replace the board because it says Ht or CF.

   If fail: Fix the stat, harness, or data pair before you change parts.

3. 3 Watch one full sequence

   Leave power on. Watch ComfortBridge IFC · three 7-segment digits + menu buttons through one cycle and write the first real fault that replaces this status word.

   Expect: Call: Communicating stat requests a percent capacity. This is not a W2 close. On 24V fallback a W call starts heat; the IFC still picks the firing rate from its tables.

Failed to sense flame after 3 retries. 1-hour auto reset.

1. 1 Watch one full try — do not reset

   Write the Amana AMVM97 code. Watch inducer, HSI glow, valve click, flame, µA. The step that dies is the repair. Resetting only burns another try into a harder lockout. Watch one full try: inducer ramp, HSI, valve, flame, µA.

   Expect: Call → Variable inducer / prove → HSI / modulating valve → Blower → Modulate → Satisfied

2. 2 Gas and the valve

   Cock open, inlet pressure, then manifold on the stage that is failing vs the rating plate. 24 VAC at the valve during trial? Coil ohms? A valve that never opens looks like a ‘bad igniter’ if you did not watch the sequence. Gas supply. Modulating valve actually opening (not a stuck two-stage solenoid test).

   Expect: Inlet and manifold on the plate. 24 VAC only during trial.

3. 3 Flame prove, then the lockout timer

   Glow + valve + no prove → rod, ground, or IFC sense. Prove then drop → µA / PS / limit. Soft lockouts on this family often auto-reset on a long clock — do not sit on resets. Rod and ground. Do not sit on hourly resets.

   Expect: Flame rod: µA per this IFC sticker at the rate it is firing, not only at high fire.

Variable inducer is running and the pressure switch / band for that rate never made. Same 96% trap/hose/vent physics as other Amana condensing furnaces — not ‘unplug the low-fire tee.’

1. 1 Prove inducer and the live code

   Do not pull power — that clears the Amana AMVM97 active code. Write E2. Is the inducer spinning on this call? Silent inducer is not a pressure switch. Inducer actually spinning and ramping? 120 VAC and a speed change.

   Expect: Inducer: Variable speed. Must ramp with requested rate. 120 VAC present; speed change on a high-fire menu test.

   If fail: 120 VAC missing → IFC / door switch / incoming power. Voltage + dead motor → inducer.

   If pass: Inducer running + this code → trap, hose, switch, vent (step 2).

2. 2 Trap, collector, and the hose

   A drowned 96% trap will not make collector pressure. Pull the trap, flush it, confirm the collector box and inducer outlet are not full. Hose cracked, off the port, or full of water fakes an open switch. Trap, collector, and condensate first.

   Expect: Trap flowing, hose dry and downhill, ports not swapped on a two-switch board.

3. 3 Switch ohms, then vent load

   Ohm the pressure switch: NO, must close when that inducer speed is making the collector setpoint. If the switch is good, walk the PVC — bird screen, ice, long 2" run, wind, shared chase. Hose dry, on the correct port, not pinched. Cracked hose fakes an open band.

   Expect: Pressure band: Switch(es) prove draft at the running band. Not a two-stage low/high tee.

   If fail: Replace the open switch only after the vent and trap are proven.

   If pass: Switch closes on draft and the code stays → IFC input.

Limit opened. Airflow or overfire. Rollout is still a manual-reset hazard.

1. 1 Treat this as flame outside the exchanger

   Do not reset the Amana AMVM97 rollout and walk away. Write the code, kill the call, and look for flame at the burners, crossover, and vestibule before you do anything else.

   Expect: No flame outside the exchanger. Burners seated. Crossover lit.

   If pass: Still inspect secondary / flue / condensate before you reset.

2. 2 Secondary, condensate, and flue

   Blocked secondary, drowned collector, or a plugged flue pushes flame out the front. Pull the inducer/collector look, confirm the trap is flowing, and check PVC/vent. IFC heat CFM, not a tap. Filter, coil, static. Firing rate vs plate — a valve stuck toward 100% will limit.

   Expect: Dry collector, open flue, trap clear.

3. 3 Reset only after the cause is fixed

   Manual-reset rollout. Recurring rollout on Amana AMVM97 is a CO / fire call — cracked primary, misaligned burners, or a failed secondary. Confirm CO in the space before you leave. Limit ohms after it cools. Recurring rollout → exchanger / burners / flue.

   Expect: One clean cycle after the cause is fixed. No second reset as a repair.

Rod sees flame with the modulating valve commanded closed.

1. 1 Shut the gas cock first

   On Amana AMVM97 the rod sees flame with the valve de-energized. Shut the cock. If flame stays, the valve is leaking — replace it. Do not jump or energize it as a test. Shut the gas cock. If flame stays, leaking valve — replace, do not jump.

   Expect: Flame dies when the cock is shut.

   If fail: Leaking valve. Replace. Do not leave the unit.

2. 2 Rod and IFC flame circuit

   If flame dies with the cock shut, the rod is shorted to ground or the IFC flame circuit is lying. Unplug the rod, inspect ceramic, and check the harness for a rub-through on the collector. Rod shorted to ground or IFC flame circuit.

   Expect: Rod isolated from ground. IFC does not report flame with the rod unplugged.

3. 3 Confirm valve solenoids are actually off

   Measure 24 VAC at both solenoids after the call drops. A welded IFC relay or a shorted W will keep a solenoid wet and look like ‘unexpected flame.’ Replace the IFC only after the valve and rod are proven.

   Expect: 0 VAC at both solenoids after the call. No flame.

Low-voltage fuse open. Operation inhibited except the display.

1. 1 Find the 24 V short before you replace the fuse

   On Amana AMVM97 an open IFC fuse is a short on W, Y, G, HUM, EAC, or a data pair landed on 24 V. Unplug the thermostat / data harness first. 24 V short on the stat harness, humidifier, EAC, or a leftover data pair on R/C.

   Expect: Fuse out. 24 V transformer still good. Harness isolated.

2. 2 Replace the fuse with the harness off

   New fuse, harness still off. If it holds, the short is in the field wiring or accessory. Plug one circuit back at a time (W, then Y, then HUM/EAC). Unplug the harness and replace the fuse. Repeat blow = board or valve harness.

   Expect: Fuse holds with harness off. Dies when the shorted lead lands.

3. 3 If it blows with the harness off

   Short is on the Amana AMVM97 IFC or the gas-valve harness. Unplug the valve and try once more. Repeat blow with valve unplugged = IFC.

   Expect: Do not keep feeding fuses into a welded valve coil or a burned IFC trace.

Flame present, signal below threshold. Lazy flame at a low modulating rate is a common miss.

1. 1 Measure µA while it is running

   Do not clean first and guess. Series-µA the rod on Amana AMVM97 during a call. Falling µA is oxide, ground, or a dying flame. A hard drop is often the pressure switch or limit opening, not the rod. Clean rod, chassis ground.

   Expect: Flame rod: µA per this IFC sticker at the rate it is firing, not only at high fire.

2. 2 Rod, ground, then gas

   Clean the rod with a non-scratch pad — not sandpaper. Chassis ground to burner box and IFC (painted screw and missing star washer are classic). Then manifold on the stage that is dropping and confirm LP conversion leftovers. Manifold at the rate the IFC is actually firing, not just a ‘high-fire’ number.

   Expect: Manifold on the rating plate. Solid burner-box ground.

3. 3 Prove it is not a switch opening

   Watch the live Amana AMVM97 display when flame drops. A PS or limit code that appears at the drop means the rod was a victim. Inducer, hose, vent wind, or a limit on a wrong heat tap. LP conversion and orifice.

   Expect: µA stable and the live code stays a flame code — then rod/valve/IFC. Otherwise chase the new code.

Igniter open, unplugged, or ground check failed.

1. 1 Ohms at the igniter, then at the IFC

   On Amana AMVM97 measure cold ohms at the igniter plug, then at the IFC connector. An open at the plug is the element or local harness. Open only at the IFC is the harness rub-through on the collector. Nitride ohms per sticker. 120 VAC during warm-up.

   Expect: Nitride cold ohms per THIS door sticker — do not use an 80% Norton chart.

2. 2 120 VAC during warm-up

   Call for heat and measure 120 VAC at the igniter during the warm-up window. 0 V + good ohms = IFC igniter relay. Voltage + no glow = cracked nitride. Burner-box ground. Cracked element.

   Expect: 120 VAC only during warm-up. Visible glow before the valve opens.

3. 3 Do not keep cycling a cracked element

   A cracked nitride can ohm ‘good’ cold and open hot. If ohms and voltage are good and there is no glow, replace the igniter. Confirm polarity/ground (this plate’s polarity code) before you condemn a new igniter.

   Expect: One clean light after a known-good igniter and a proven ground.

Inducer will not make the high-rate draft band. This is not ‘the high-fire PS tee on a two-stage collector.’ The unit may run at a reduced percent and never reach high fire.

1. 1 Prove the high-fire call

   Write the live Amana AMVM97 code before you pull power. Confirm this IFC is actually commanded to high — W2 at the board, or the staging timer has expired. Force high fire from the IFC / CoolCloud GPT menu — do not jump W2.

   Expect: R to W2 ~24 VAC (conventional) or a high-stage request on a communicating stat.

   If fail: No high request → thermostat / staging / menu. Not a high-fire pressure switch.

   If pass: Go to step 2. Do not jump the high-fire switch to ‘see if it runs.’

2. 2 Prove the inducer actually went high

   Listen and amp the inducer on low vs high. No speed-up → IFC high output or inducer winding. Speed-up and this code still live → high-fire PS path (hose, switch, vent). Inducer actually at high speed? Variable inducer that will not climb is E9 with a good switch.

   Expect: Inducer: Variable speed. Must ramp with requested rate. 120 VAC present; speed change on a high-fire menu test.

   If fail: Measure 120 VAC on the high-speed inducer lead during the high call. 0 V = IFC. Voltage + dead motor = inducer.

3. 3 Isolate the HIGH hose and switch

   High-fire hose on the high tap only — a tee with the low switch is the common first-install miss on this dual-switch plate. Blow the hose, confirm it is dry and downhill to the collector. Ohm the high-fire switch: it is NO and must close only on high draft. Vent sized for high fire on this cabinet. Trap that only loads at high rate.

   Expect: Pressure band: Switch(es) prove draft at the running band. Not a two-stage low/high tee.

   If fail: Welded open, cracked hose, or water in the line. Replace the failed part — do not leave a jumper.

   If pass: Switch and hose good → step 4 (vent / condensate / IFC).

4. 4 Vent, condensate, and the IFC input

   High fire needs more draft than a low-fire code ever saw. Check PVC size on this cabinet, shared chase, wind, ice, bird screen, and condensate backing into the collector only on high. If the switch closes on known draft and the code stays, the Amana AMVM97 IFC input is the last call.

   Expect: Clear vent, dry collector, known-good switch, then IFC.

L1/N reversed or chassis ground missing. Furnace will not operate.

1. 1 Hot and neutral at the IFC, not the disconnect

   On Amana AMVM97 polarity/ground is measured at the board. A correctly landed disconnect with a swapped whip at the IFC still throws this. Hot and neutral at the IFC.

   Expect: L1 hot, N neutral, ~120 VAC L1 to N, ~0 VAC N to ground.

2. 2 Burner-box and IFC ground

   Green ground to cabinet and IFC. Painted screw and missing star washer fail the ground check and kill flame sense. Burner-box ground screw.

   Expect: Near-zero ohms burner box to IFC ground screw.

3. 3 Then flame and HSI

   Polarity/ground faults take out HSI and flame sense together. After the wiring is right, run one heat cycle and confirm µA and igniter glow before you change those parts.

   Expect: Code cleared. One clean light. µA in range.

No line voltage, door switch open, or internal control condition. This is power, not a data-pair code.

1. 1 Measure at the IFC under load

   On Amana AMVM97 line-voltage codes are incoming power. Measure L1/L2 (or L1/N) at the board while it is trying to run, not just at the disconnect. Switch, breaker, door switch. 115 VAC at L1/N.

   Expect: Voltage in the rating-plate window under load.

2. 2 Drop, breaker, and the whip

   Large drop from the disconnect to the IFC is a loose lug or damaged whip. Breaker that will not hold under inducer/blower start is the circuit, not the board. If the IFC is alive and the stat is dark, that is the data pair — not EE.

   Expect: Minimal drop. Tight lugs. Correct breaker size.

3. 3 Transformer 24 V last

   If line is good and 24 V is low, load the transformer (stat + valve + accessories). A collapsing 24 V looks like a comm or fuse call.

   Expect: 24 V holds under load. Line stays in window.

IFC commanded the serial ECM and does not detect it running.

1. 1 Reseat the serial plug

   On Amana AMVM97 this is a communicating / serial ECM, not a tap motor. Kill power, reseat the 14-pin (or OEM serial plug) at the motor and at the IFC. Pins straight, no corrosion. 14-pin harness at motor and IFC. No tap plugs.

   Expect: Plug fully seated both ends. Correct motor for this cabinet.

2. 2 Power and the data pair at the motor

   Line voltage at the motor, then the serial/data pair continuity. A half-seated plug or a pinched harness throws comm on a good motor. Do not install an AR9T96 9-speed or an AMVC96 motor of the wrong HP.

   Expect: Line voltage present. Data pair not shorted to chassis.

3. 3 Motor vs IFC serial driver

   Known-good motor still throws this code = Amana AMVM97 IFC serial driver. Known-good IFC still throws it = motor module. Do not put a PSC or 9-speed tap motor on a serial IFC. Wheel free, 120 VAC to the motor.

   Expect: One clean CFM request after a known-good pair.

IFC cannot talk to the variable-speed blower.

1. 1 Reseat the serial plug

   On Amana AMVM97 this is a communicating / serial ECM, not a tap motor. Kill power, reseat the 14-pin (or OEM serial plug) at the motor and at the IFC. Pins straight, no corrosion. 14-pin seated, pins straight.

   Expect: Plug fully seated both ends. Correct motor for this cabinet.

2. 2 Power and the data pair at the motor

   Line voltage at the motor, then the serial/data pair continuity. A half-seated plug or a pinched harness throws comm on a good motor. Motor vs IFC: known-good motor still b1 = IFC serial driver.

   Expect: Line voltage present. Data pair not shorted to chassis.

3. 3 Motor vs IFC serial driver

   Known-good motor still throws this code = Amana AMVM97 IFC serial driver. Known-good IFC still throws it = motor module. Do not put a PSC or 9-speed tap motor on a serial IFC.

   Expect: One clean CFM request after a known-good pair.

b2 = motor HP does not match the shared-data set. b3 = motor folding back on power/speed/temp. b9 = airflow below calculated minimum.

1. 1 Read the plug / card on THIS cabinet

   On Amana AMVM97 the model plug or shared-data card must match this cabinet size. A 100 kBtu plug in an 80 cabinet overfires and limits. A leftover memory card after a control swap throws d0/d4-class codes. Correct AMVM97 motor and memory card.

   Expect: Plug / card part matches the rating plate and the replacement control bulletin.

2. 2 Reseat, then confirm the menu

   Kill power, reseat, restore power. On communicating plates open the setup and confirm unit size / motor HP. Static, filter, coil. CFM follows modulating rate — a brick duct still b9s.

   Expect: IFC recognizes the plug. No size-mismatch code.

3. 3 Do not run it mismatched

   A wrong plug is not a ‘temporary’ fix. It will throw limit, ignition, or blower-band codes that look like bad parts. Fit the correct plug, then re-run the original complaint. Wrong CoolCloud outdoor type / CFM table.

   Expect: One clean sequence on the correct identity.

d0 = no shared-data set on a replacement IFC. d4 = wrong-model card.

1. 1 Read the plug / card on THIS cabinet

   On Amana AMVM97 the model plug or shared-data card must match this cabinet size. A 100 kBtu plug in an 80 cabinet overfires and limits. A leftover memory card after a control swap throws d0/d4-class codes. Install the AMVM97 card, not an AMVC96 two-stage card.

   Expect: Plug / card part matches the rating plate and the replacement control bulletin.

2. 2 Reseat, then confirm the menu

   Kill power, reseat, restore power. On communicating plates open the setup and confirm unit size / motor HP. GMVM97 twin card is the usual cross. AVPTC / AR9T96 cards are d4.

   Expect: IFC recognizes the plug. No size-mismatch code.

3. 3 Do not run it mismatched

   A wrong plug is not a ‘temporary’ fix. It will throw limit, ignition, or blower-band codes that look like bad parts. Fit the correct plug, then re-run the original complaint. Empty tables will not drive the serial ECM or calculate CFM.

   Expect: One clean sequence on the correct identity.