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ICP Furnace Error Codes

Updated · by Aurora Star Tech Inc.

19 ICP Furnace error codes and diagnostic codes, with causes and troubleshooting steps for each. Select a code, or find your model below.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

ICP Furnace error codes list

CodeMeaningSeverity
1+2Blower on after power-up (normal)Low
1+5Blower motor lockoutHigh
2Pressure switch did not openMedium
2+5Invalid model selection or setup errorMedium
3Low pressure switch did not close or reopenedMedium
3+5Gas valve fault (modulating valve)High
4Limit circuit faultHigh
4+1Blower motor faultHigh
4+2Inducer motor faultHigh
4+3Low/medium pressure switch open while medium/high switch closedMedium
5Abnormal flame-proving signalCritical
6Ignition proving failureHigh
6+1Ignition lockoutHigh
7Limit circuit lockoutHigh
8Gas heating lockoutCritical
9Medium/high pressure switch or PSR relay did not close or reopenedMedium
10Line voltage polarityMedium
LED offAmber status LED off - no power / blown 3 A fuseHigh
LED steady ONAmber LED on solid - control lockout / wrong model plugHigh

Find codes by ICP model

G9MAE0601714G9MAE0602120G9MAE0801714G9MAE0802120G9MAE1002122G9MAE1202422

Furnace troubleshooting guides

Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

© 2026 Aurora Star Tech Inc. All rights reserved. This page may not be copied, republished or used to train other systems without written permission.

Emergency Furnace Repair

647-657-2977