HVACopedia

ICP · Furnace

2+5 Invalid model selection or setup error

Medium severity ICP (F/G)9MAE Modulating Furnace

What the control is telling you

If it flashes only 4 times at power-up, model plug PL4 is missing and the board is using the model stored in memory. If it flashes continuously, there is a setup error.

Applies to: ICP F9MAE / G9MAE modulating variable-speed condensing gas furnaces (060, 080, 100, 120 kBtu/h)

Likely causes

  • Model plug PL4 missing and no valid model in memory (common on a service replacement board)
  • Thermostat call while SW1-1 is ON
  • Thermostat call while SW1-6 is ON
  • SW1-1 and SW1-6 both ON
  • Two different furnace models twinned
  • Wrong replacement control - needs modulating board with software V17 or later

Test and repair steps

  1. Install the correct model plug PL4 shown on the rating plate.
  2. Turn SW1-1 and SW1-6 OFF for normal operation.
  3. If twinned, verify both furnaces are the same model.
  4. On a replacement control, confirm it is the modulating board with software V17 or later.
  5. Cycle power and confirm heartbeat.

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: ICP (F/G)9MAE Service and Technical Support Manual 440 04 4700 00, Figure 16 Troubleshooting Chart, p.34. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.