ICP Error Code Amber LED heartbeat: Amber LED heartbeat – normal operation (Furnace)

Updated October 15, 2026 · by Aurora Star Tech Inc.

ICP error code Amber LED heartbeat on a furnace means: Amber LED heartbeat - normal operation. It is also called ICP diagnostic code Amber LED heartbeat.

Low severityFurnaceICP (F/G)9MAE Modulating Furnace

Homeowner? What ICP code Amber LED heartbeat means for you

Usually minor Your furnace is reporting: Amber LED heartbeat - normal operation. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does ICP error code Amber LED heartbeat mean?

The amber status LED on the 9MAE control pulses bright-dim (a heartbeat) when the control is powered and has no faults. It also appears after the stored-code readout and after the 90-second blower-only period that follows a power interruption during a heat call. Normal.

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

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

ICP models that use code Amber LED heartbeat

G9MAE0601714 G9MAE0602120 G9MAE0801714 G9MAE0802120 G9MAE1002122 G9MAE1202422

Other ICP Furnace codes

Code	Meaning
6	Ignition proving failure
6+1	Ignition lockout
7	Limit circuit lockout
8	Gas heating lockout
9	Medium/high pressure switch or PSR relay did not close or reopened
10	Line voltage polarity
Component self-test (SW1-6)	Furnace component self-test
LED off	Amber status LED off - no power / blown 3 A fuse
LED steady ON	Amber LED on solid - control lockout / wrong model plug
Status code recall (SW1-1)	Read the last 7 stored status codes

All ICP Furnace error codes →

ICP code Amber LED heartbeat: homeowner questions

What does ICP code Amber LED heartbeat mean?

Amber LED heartbeat - normal operation. The amber status LED on the 9MAE control pulses bright-dim (a heartbeat) when the control is powered and has no faults. It also appears after the stored-code readout and after the 90-second blower-only period that follows a power…

Is it safe to keep using my furnace with code Amber LED heartbeat?

Usually yes. Code Amber LED heartbeat is normally minor, but if it keeps coming back have it checked.

Can I reset ICP code Amber LED heartbeat myself?

You can try one reset (power off for 30 seconds, then on). If ICP code Amber LED heartbeat comes back, the cause is still there and a licensed technician should check it.

Who can fix ICP code Amber LED heartbeat near me?

Aurora Star Tech Inc. repairs ICP furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

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

Troubleshooting guides

Blowing cold air All brands · Furnace
No heat All brands · Furnace
Short cycling All brands · Furnace
Check inlet gas pressure ICP · Furnace
Component self-test ICP · Furnace
Cut the cooling blower off-delay to 5 seconds (9MAE) ICP · Furnace
Lock the furnace in a heat stage for testing (9MAE) ICP · Furnace
No heat - control does not respond to thermostat ICP · Furnace
Reading and retrieving status codes ICP · Furnace
Recall the last 7 stored status codes (SW1-1) ICP · Furnace
Reset an ignition lockout (9MAE) ICP · Furnace
Run the furnace component self-test (SW1-6) ICP · Furnace

Source: ICP (F/G)9MAE Service Manual 440 04 4700 00, Retrieving Stored Fault Codes p.22 and Sequence of Operation pp.34-35. Written in our own words as a summary; always check the original manual.

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.