ARVT96

This board

ComfortBridge IFC · three 7-segment digits + UP/MENU/DOWN · CoolCloud

• Three digits and menu buttons (UP / MENU / DOWN) — not the AR9T96 single 7-seg and not 9-speed taps. Status words (idle, Ht1, Ht2, CF, CL1, CL2) are run states, not faults.
• SS wiring p.9 is the ComfortBridge menu IFC — no E-code table printed on that sheet. Door card on THIS cabinet wins. ComfortBridge two-stage language on this family is E0–E9 (dual PS), b0–b9 (serial ECM), d0/d4 (memory card).
• Shared-data memory card is ARVT96. d0 = no card / empty set. d4 = wrong-model card (AMVC96, AMVM97, AR9T96, AVPTC). The replacement board will not drive the serial ECM without the correct ARVT96 card.
• Compatible with any single-stage thermostat (SS). 24V W/W1 fallback is legal. CFM still comes from IFC tables, not tap plugs. A leftover data pair shorted to R/C will look like a dead bus.
• CoolCloud Bluetooth is the menu for CFM, outdoor type, and commissioning. Do not look for F01–F09 heat taps — there are none.

Sequence

1. Call. Communicating stat requests heat capacity, or a single-stage 24V stat closes W. CFM still comes from the IFC tables, not taps.
2. Prove limits. IFC proves primary/aux/rollout closed. Open limit → E3. Open 24V fuse → E5. No 115V / door switch / internal → EE.
3. Low inducer / LPS. Two-speed inducer starts low. Low-stage PS must close. Already closed with inducer off → E1. Never closes → E2.
4. HSI / low-fire valve. Silicon nitride warm-up, then first-stage solenoid. Open igniter / no-ground → E7. Flame must prove. Failures stack toward E0.
5. Blower. Serial ECM ramps to the IFC heat CFM table. SS rec. high-heat CFM is cabinet-specific (1025 on 0403BN through 2150 on 1205DN). Silent motor → b0/b1. Do not hang an AR9T96 9-speed motor on this harness.
6. High fire. Communicating capacity or W2 / staging timer. Inducer goes high. High-stage PS must close (E9 if open, E8 if already closed). Second-stage solenoid opens.
7. Satisfied. Valve off, inducer post-purge, blower heat-off delay. Unexpected flame after valve-off → E4.

Faults on this IFC

• idle / Ht1 / Ht2 / CF / CL1 / CL2

  Status, not a fault

  info

  Normal run states on the triple display. idle = standby. Ht1 / Ht2 = low / high heat. CF = continuous fan. CL1 / CL2 = cooling stage.

  • Do not replace the board because it says Ht1 or CF.
  • Ht1 forever with a high-fire request → staging / E8–E9 path, not a ‘bad Ht1 code.’
• E0

  System / ignition lockout

  lockout

  Control failed to sense flame after retries and shut off gas.

  • Watch one full try: inducer, HSI glow, valve click, flame, µA.
  • Gas supply and manifold (low then high).
  • Ground and flame-rod cleanliness.
  • Do not sit on hourly resets — find which step dies.
• E1

  Low-stage PS stuck closed

  lockout

  Low-stage pressure switch is made with the inducer off.

  • Unplug the LPS. If the code changes, the switch is welded or the hose is holding residual draft.
  • Hose routed downhill? Water fakes a closed switch.
  • IFC input shorted — only after the switch ohms open.
• E2

  Low-stage PS stuck open

  lockout

  Inducer is on low and the low-stage switch will not close.

  • Inducer spinning? 120 VAC at the inducer on a heat call.
  • Collector box, inducer outlet, and condensate trap — this 96% will not make pressure with a full trap.
  • PVC intake/exhaust (bird screen, ice, long run, wind).
  • LPS hose cracked or on the wrong port (low vs high tap).
• E3

  Open primary / aux / rollout limit

  warn

  A limit opened. Airflow or overfire. On this plate, heat ESP above 0.5" is a documented hard limit.

  • IFC heat CFM vs the SS rec. CFM for this SKU — not a 9-speed tap.
  • Total external static in HEAT. SS p.7: do not operate above 0.5" w.c. ESP in heating. 0.5–0.8" tables are cooling only.
  • Filter, wheel, coil, return size. Bottom-return flanges unfolded (SS: ~18% loss if left folded).
  • Manifold low and high vs rating plate. Recurring rollout → exchanger / burners / flue.
• E4

  Flame sensed with no call for heat

  hazard

  Rod sees flame with both solenoids de-energized.

  • 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 on the IFC is open.

  • 24 V short on W, Y, G, humidifier, EAC, or a leftover data pair landed on R/C.
  • Unplug the tstat / data harness and replace the fuse.
• E6

  Low flame-sense µA

  warn

  Flame is present but the micro-amp signal is below the IFC threshold.

  • Clean rod with a non-scratch pad — not sandpaper.
  • Chassis ground to burner box and IFC.
  • Manifold / orifice / LP conversion (this plate is LPM-34 on every SKU).
• E7

  Igniter open / no-ground

  lockout

  Igniter is open, not connected, or the IFC failed its ground check.

  • Nitride ohms per sticker. 120 VAC during warm-up.
  • Burner-box ground screw and painted-cabinet star washer.
• E8

  High-stage PS stuck closed

  lockout

  High-stage pressure switch is made with the inducer not on high. Furnace runs low only.

  • This is the second switch — do not confuse with E1.
  • Welded HPS or water-filled hose.
  • IFC calling high when it should be low — W2 shorted to W1 on 24V fallback.
• E9

  High-stage PS stuck open

  lockout

  Inducer on high, high-stage switch never closes. Classic ‘runs on low, will not go high.’

  • Inducer actually changes speed on a high-fire request? Listen / amp it.
  • HPS hose on the high-fire tap, not teed to the low switch.
  • Vent capacity / wind / shared chase. High fire needs more draft than E2 ever saw.
  • Condensate backing into the collector only under high fire.
• EA

  Reversed polarity / poor ground

  lockout

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

  • Hot and neutral at the IFC, not just the disconnect.
  • Burner box to IFC ground screw.
• EE

  No 115V to control / internal / door switch

  lockout

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

  • Furnace switch, breaker, and blower-door switch fully made.
  • 115 VAC at L1/N on the IFC.
  • 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 seated at motor and IFC. No tap plugs on this motor.
  • 120 VAC to the motor, wheel free, no wet winding.
  • Do not install an AR9T96 9-speed motor as a ‘cheaper ECM’ — it will not talk this serial bus.
• b1

  ECM communications lost

  lockout

  IFC cannot communicate with the variable-speed blower.

  • Same 14-pin harness — pins bent, corrosion, half-seated.
  • Motor vs IFC: if a known-good motor still b1s, the IFC serial driver is the fault.
• b2

  Motor HP mismatch vs shared-data set

  lockout

  Connected motor horsepower does not match the value in the furnace shared-data set.

  • Wrong replacement motor for this cabinet size.
  • Wrong memory card after an IFC swap (see d0/d4). An AMVC96 card is the usual miss on this new plate.
• b3 / b9

  Motor limiting / low indoor airflow

  warn

  b3 = folding back on power/speed/temp. b9 = airflow below calculated minimum.

  • Filter, coil, TES. Heat ESP must stay ≤ 0.5" on this SS — a brick duct is b9 / E3, not a bad motor.
  • IFC heat CFM vs the SS rec. CFM for this SKU (1025–2150).
  • Return undersized or a 5" media cabinet the installer added.
• b4 / b5 / b7

  Motor trip / locked rotor / failed start

  lockout

  b4 = lost rotor or overload. b5 = locked rotor after start attempts. b7 = failed to start / missing parameters.

  • Wheel rub, debris, seized bearings.
  • Static so high the motor cannot start the wheel — prove TES before a motor.
  • Harness intermittents look like b7. Prove the 14-pin before a motor or IFC.
• d0 / d4

  Shared data / memory card

  lockout

  d0 = IFC has no shared-data set (replacement board, missing card). d4 = card rejected (wrong model card).

  • After an IFC swap the ARVT96 memory card must be installed and seated.
  • An AMVC96, AMVM97, AVPTC, or AR9T96 card is d4 on this plate. The card is labeled for THIS model, not ‘any ComfortBridge 96%.’
  • Do not run the furnace on empty shared data and guess CFM.

Workflows

Test points

Data pair

OEM communicating voltage / polarity — never 24 VAC between the data pins. Single-stage 24V fallback is legal; CFM still from IFC tables.

Motor harness

14-pin serial ECM, fully seated. No tap plugs. Do not hang an AR9T96 9-speed here.

Heat ESP

≤ 0.5" w.c. in heating (SS p.7 hard limit). 0.5–0.8" is cooling only.

Heat CFM

SS rec. high-heat: 0403BN 1025 · 0603BN 1200 · 0803BN 1400 · 0804CN 1760 · 1005CN 1770 · 1005DN 2000 · 1205DN 2150.

LPS / HPS

Both NO. Two hoses, two taps, never teed. Closed only when that inducer speed is making the collector setpoint.

Manifold low / high

Natural ~1.6–1.9 / 3.2–3.5 in. w.c. class — rating plate wins. Clock input if in doubt.

HSI

Nitride, 120 VAC during warm-up. Cold ohms per sticker.

Memory card

Seated ARVT96 card after any IFC swap. AMVC96 card is d4.

Gotchas

• Techs treat ARVT96 like AR9T96 and start looking for heat taps. There are none. Triple display + 14-pin serial motor + CoolCloud.
• Techs treat ARVT96 like AMVC96 and drop in the older memory card. d4, silent blower. The card is labeled ARVT96.
• 0.5" heat ESP is a hard limit on this SS, not a suggestion. A duct that ‘ran fine’ on a 9-speed AR9T96 can E3/b9 here.
• Furnaces ship on high-speed cooling. Installer must set CoolCloud / menu CFM. Leaving it on high heat CFM in a tight return is an E3 call.
• LPM-34 is the LP kit on every ARVT96 / ADVT96 SKU. Not LPM-33 (AR9S96) and not LPM-30 (AR9T96 0303AN).
• Single-stage thermostat is legal. That does not turn this into a tap furnace. CFM still comes from the IFC tables.
• Bottom return: unfold the flanges. SS notes ~18% airflow loss — looks like a limit/noise call on a brand-new install.
• Door card on THIS cabinet wins. The spec-sheet wiring page has the ComfortBridge menu, not a printable E-table.

Related plates

• amana-amvc96 — Older ComfortBridge two-stage VS cousin. Same E/b/d language — different memory card and no 0.5" heat-ESP hard limit on that plate.
• amana-ar9t96 — 9-speed tap, conventional 24V, single 7-seg. Do not use that chart on this communicating VS IFC.
• amana-ar9s96 — Single-stage 9-speed sister — one PS, 0140F20003-B, E0–E7. Not ComfortBridge.
• amana-amvm97 — Modulating ComfortBridge cousin — 0–100% valve and variable inducer. Do not apply two-stage staging tests.
• goodman-gmvc96 — Goodman ComfortBridge two-stage twin of AMVC96 — not this newer ARVT96 plate.