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ICP · technician tips

ICP service menus, test modes and resets

6 tips for furnace, heat pump: access codes, button combinations, test modes and the resets you need at the appliance.

Jump to: Service & test modes (4) · Reset & cancel (1) · Settings shortcuts (1)

Service & test modes

Forced fan, low and high fire, test and diagnostic modes, error history and live data.

Lock the furnace in a heat stage for testing (9MAE)

Furnace · ICP (F/G)9MAE Modulating Furnace

Setup switches and an R jumper hold the furnace in minimum, intermediate or maximum heat. Return SW1-2 and SW4-2 to OFF unless a 2-stage thermostat is used, and leave SW1-1 and SW1-6 OFF.

  1. Minimum: SW1-2 ON, SW4-2 OFF, jumper R to W/W1
  2. Intermediate: SW1-2 OFF, SW4-2 ON
  3. Maximum: jumper R to W/W1 and W2
  4. Afterwards return SW1-2 and SW4-2 to OFF (unless 2-stage thermostat)

Applies to: (F/G)9MAE0601714A, 0602120A, 0801714A, 0802120A, 1002122A, 1202422A

Source: ICP (F/G)9MAE Service and Technical Support Manual 440 04 4700 00, Figure 4 Furnace Setup Switch Description, p.12 (PDF; printed p.10). Written in our own words; check the manual for your exact model.

Recall the last 7 stored status codes (SW1-1)

Furnace · ICP (F/G)9MAE Modulating Furnace

Setup switch SW1-1 ON plus the blower door switch makes the amber LED flash up to seven stored codes in order, then a heartbeat flash. Codes survive power loss.

  1. No thermostat call present and all blower-off delays finished
  2. Leave 115 V on and remove the blower door
  3. Turn SW1-1 ON and manually close the blower door switch
  4. Watch the LED: up to 7 codes flash, then a heartbeat
  5. Turn SW1-1 OFF, release the door switch and refit the door

Applies to: ICP (F/G)9MAE modulating furnaces

Source: ICP (F/G)9MAE Service Manual 440 04 4700 00, Retrieving Stored Fault Codes, p.22. Written in our own words; check the manual for your exact model.

Run the furnace component self-test (SW1-6)

Furnace · ICP (F/G)9MAE Modulating Furnace

Setup switch SW1-6 starts a self-test: inducer, gas valve communication check, igniter 15 s, blower mid airflow 15 s, then inducer stops. At the end the LED flashes a result: heartbeat, 2+5, 3+5, 4+1 or 4+2.

  1. Remove the blower door and take the wire off the R terminal
  2. Turn SW1-6 ON
  3. Manually close the blower door switch and watch the test run
  4. Release the switch, reconnect R and refit the door; to repeat turn SW1-6 OFF then ON

Applies to: ICP (F/G)9MAE modulating furnaces

Source: ICP (F/G)9MAE Service Manual 440 04 4700 00, Component Self-Test, p.22. Written in our own words; check the manual for your exact model.

Force a defrost with the SPEEDUP pins

Heat pump · ICP N4H3 Heat Pump

With the unit heating and the defrost thermostat closed, shorting the SPEEDUP pins forces a defrost. Outdoor fan stops and strip heat comes on during defrost.

  1. Run the unit in heating with the defrost thermostat closed (or jumper the DFT terminals)
  2. Short the SPEEDUP pins with a screwdriver until the reversing valve shifts
  3. Remove the short at once for a brief defrost, or keep it for 2+ seconds to go straight back to heating

Applies to: ICP N4H3 heat pumps

Source: ICP N4H3 Installation Instructions, Defrost System (defrost control board and testing). Written in our own words; check the manual for your exact model.

Reset & cancel

Clearing lockouts, service reminders and fault history; skipping purge or de-air programs.

Reset an ignition lockout (9MAE)

Furnace · ICP (F/G)9MAE Modulating Furnace

Ignition lockout auto-resets after 3 hours; to reset sooner, briefly cut power.

  1. Briefly cut 115 V to the furnace, or cut 24 V at SEC1/SEC2 (not at the thermostat terminals)

Applies to: (F/G)9MAE0601714A, 0602120A, 0801714A, 0802120A, 1002122A, 1202422A

Source: ICP (F/G)9MAE Service and Technical Support Manual 440 04 4700 00, Sequence of Operation, p.36-38 (PDF; printed p.34-36). Written in our own words; check the manual for your exact model.

Settings shortcuts

Where the useful parameters live and what they are set to from the factory.

Cut the cooling blower off-delay to 5 seconds (9MAE)

Furnace · ICP (F/G)9MAE Modulating Furnace

Cooling off-delay is 90 s; jumpering Y (or Y1) to DHUM cuts it to 5 s.

  1. Jumper Y (or Y1) to the DHUM terminal
  2. Cooling blower off-delay drops from 90 s to 5 s

Applies to: (F/G)9MAE0601714A, 0602120A, 0801714A, 0802120A, 1002122A, 1202422A

Source: ICP (F/G)9MAE Service and Technical Support Manual 440 04 4700 00, Table 2 Blower Speed Taps, p.11 (PDF; printed p.9). Written in our own words; check the manual for your exact model.

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ICP error codes

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For licensed technicians. Installer menus, test modes and access codes change settings that affect safety; only use them if you are trained on the appliance and understand the result. Gas, electrical and refrigerant work must be done by a qualified, licensed person, and the manufacturer’s manual for the exact model and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.