AMVM97

This board

ComfortBridge IFC · three 7-segment digits + menu buttons

• Same triple 7-seg and E/b/d language as AMVC96. Status words (idle, Ht, CF) are run states, not faults. Capacity is a percent, not Ht1 vs Ht2 staging.
• E2 / E9 are pressure-band / inducer proves as the variable inducer ramps — not ‘the low PS vs high PS tee’ from a two-stage collector. Do not start teeing hoses or looking for a W2 solenoid.
• Shared-data memory card is required after an IFC swap (d0/d4). Use the AMVM97 card, not an AMVC96 two-stage card.
• Force high fire from the IFC menu / CoolCloud gas-pressure test (GPT), not by jumping W2. There is no second-stage solenoid to energize.
• 24V fallback may accept a W call. The valve still modulates from IFC tables. A W2 wire does not create high fire.

Sequence

1. 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.
2. Variable inducer / prove. Inducer ramps to the pressure band for that rate. E2 = will not prove the running band (trap, hose, vent, inducer). E9 = will not make the high-capacity draft band. These are not a low-tee vs high-tee two-stage test.
3. HSI / modulating valve. Nitride warm-up, then the modulating valve opens to the requested percent. Open igniter / no-ground → E7. Flame must prove. Failures stack toward E0.
4. Blower. Serial ECM CFM follows capacity from the IFC tables. Same b0/b1/d0 motor-and-card rules as AMVC96. No tap plugs.
5. Modulate. Valve and inducer track load. Do not expect a discrete low-to-high step. High-fire manifold is a menu/GPT test, not a W2 jump.
6. Satisfied. Valve closed, inducer post-purge, blower delay. Unexpected flame → E4.

Faults on this IFC

• idle / Ht / CF

  Status, not a fault

  info

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

  • Do not replace the board because it says Ht or CF.
  • Ht that never climbs off a low rate is a prove / valve / menu problem, not a ‘stuck Ht1’ two-stage code.
• E0

  System / ignition lockout

  lockout

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

  • Watch one full try: inducer ramp, HSI, valve, flame, µA.
  • Gas supply. Modulating valve actually opening (not a stuck two-stage solenoid test).
  • Rod and ground. Do not sit on hourly resets.
• E2

  Pressure-band open / inducer will not prove

  lockout

  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.’

  • Inducer actually spinning and ramping? 120 VAC and a speed change.
  • Trap, collector, and condensate first.
  • Hose dry, on the correct port, not pinched. Cracked hose fakes an open band.
  • Vent/intake ice, bird screen, long run, wind.
• E3

  Open primary / aux / rollout limit

  warn

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

  • IFC heat CFM, not a tap. Filter, coil, static.
  • Firing rate vs plate — a valve stuck toward 100% will limit.
  • Limit ohms after it cools. Recurring rollout → exchanger / burners / flue.
• E4

  Flame sensed with no call for heat

  hazard

  Rod sees flame with the modulating valve commanded closed.

  • Shut the gas cock. If flame stays, leaking valve — replace, do not jump.
  • Rod shorted to ground or IFC flame circuit.
• E5

  Open 24V fuse

  warn

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

  • 24 V short on the stat harness, humidifier, EAC, or a leftover data pair on R/C.
  • Unplug the harness and replace the fuse. Repeat blow = board or valve harness.
• E6

  Low flame-sense µA

  warn

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

  • Clean rod, chassis ground.
  • Manifold at the rate the IFC is actually firing, not just a ‘high-fire’ number.
  • LP conversion and orifice.
• E7

  Igniter open / no-ground

  lockout

  Igniter open, unplugged, or ground check failed.

  • Nitride ohms per sticker. 120 VAC during warm-up.
  • Burner-box ground. Cracked element.
• E9

  High-capacity pressure band open

  lockout

  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.

  • Force high fire from the IFC / CoolCloud GPT menu — do not jump W2.
  • Inducer actually at high speed? Variable inducer that will not climb is E9 with a good switch.
  • Vent sized for high fire on this cabinet. Trap that only loads at high rate.
  • Hose and switch for the high band. Do not tee it to a two-stage mindset.
• EA

  Reversed polarity / poor ground

  lockout

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

  • Hot and neutral at the IFC.
  • Burner-box ground screw.
• EE

  No 115V to control / internal / door switch

  lockout

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

  • Switch, breaker, door switch. 115 VAC at L1/N.
  • If the IFC is alive and the stat is dark, that is the data pair — not EE.
• b0

  ECM blower not running

  lockout

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

  • 14-pin harness at motor and IFC. No tap plugs.
  • Do not install an AR9T96 9-speed or an AMVC96 motor of the wrong HP.
  • Wheel free, 120 VAC to the motor.
• b1

  ECM communications lost

  lockout

  IFC cannot talk to the variable-speed blower.

  • 14-pin seated, pins straight.
  • Motor vs IFC: known-good motor still b1 = IFC serial driver.
• b2 / b3 / b9

  Motor HP / limiting / low CFM

  warn

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

  • Correct AMVM97 motor and memory card.
  • Static, filter, coil. CFM follows modulating rate — a brick duct still b9s.
  • Wrong CoolCloud outdoor type / CFM table.
• d0 / d4

  Shared data / memory card

  lockout

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

  • Install the AMVM97 card, not an AMVC96 two-stage card.
  • GMVM97 twin card is the usual cross. AVPTC / AR9T96 cards are d4.
  • Empty tables will not drive the serial ECM or calculate CFM.

Workflows

Test points

Data pair

OEM communicating voltage / polarity — never 24 VAC between the data pins.

Modulating valve

Single modulating body. High-fire manifold from IFC/CoolCloud GPT, not a W2 jump. Plate wins.

Inducer

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

Pressure band

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

Flame rod

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

Motor harness

14-pin serial ECM. No tap plugs. Correct AMVM97 HP / card.

Memory card

AMVM97 (or GMVM97 twin) after an IFC swap. AMVC96 card is d4.

Gotchas

• Looks like AMVC96 until you look at the valve. Two-stage staging tests and W2 jumps waste the call.
• E2/E9 are pressure-band / inducer, not the AR9T96/AMVC96 low-tee vs high-tee story.
• GMVM97 is the Goodman-badge twin. Same chart. GMVC96 is the two-stage twin — wrong page.
• d0 after a board swap needs the AMVM97 card. An AMVC96 card will d4 and the motor will sit.
• Low-rate E6 is not always a dirty rod. Confirm manifold at the percent the IFC is actually firing.

Related plates

• amana-amvc96 — Two-stage ComfortBridge cousin — dual solenoids, two-speed inducer, E1/E2 vs E8/E9 tees. Do not use that staging playbook here.
• goodman-gmvm97 — Goodman-badge twin. Same modulating ComfortBridge IFC.