HVACopediaICP · Furnace
5 Abnormal flame-proving signal
What the control is telling you
Flame is sensed while the gas valve is off. Inducer runs until the fault clears.
Applies to: ICP F9MAE / G9MAE modulating variable-speed condensing gas furnaces (060, 080, 100, 120 kBtu/h)
Likely causes
- Gas valve stuck open or leaking through
Test and repair steps
- Warning: Gas may be flowing with the valve de-energized - shut off the manual gas valve and power if flame is present.
- Look through the sight glass for flame with no heat call.
- Check the gas valve for leak-through; replace the valve if it is stuck open or leaking.
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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.
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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.