LED off Amber status LED off - no power / blown 3 A fuse

What the control is telling you

The control shows nothing. Usually no 115 V or 24 V at the board, an open door switch, or the 3-amp 24 V fuse is blown.

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

Likely causes

• Blower door switch open
• Breaker off / no 115 V at L1-L2
• Blown 3-amp automotive fuse (24 V short)
• Failed transformer

Test and repair steps

1. Warning: Manually closing the door switch exposes live 115 V parts - use caution.
2. Check the breaker is on and there is 115 V at L1 and L2 on the control.
3. Make sure the blower door is on and the door switch is closed; confirm 115 V reaches the switch, replace switch if power goes in but not out.
4. Check for 24 V at SEC-1 and SEC-2; if 115 V is present but no 24 V, replace the transformer.
5. If the 3-amp fuse is open, replace it with a 3-amp fuse ONLY, then disconnect thermostat leads to find the short in the 24 V wiring.

Models that show this code

6 models in ICP (F/G)9MAE Modulating Furnace

Other codes on the same units

• 5 Abnormal flame-proving signal
• 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
• LED steady ON Amber LED on solid - control lockout / wrong model plug