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Error code reference
Coleman Furnace Error Code RAPID FLASHES
Reverse line voltage polarity detected; both heating and cooling will be affected.
SourceColeman Gas Furnace - Service Manual: DGAA077BDTBFurnace Control Diagnostics section
Diagnostic procedure
The full RAPID FLASHES procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check polarity of both line voltage connections.
SourceColeman Gas Furnace - Service Manual: DGAA077BDTBFurnace Control Diagnostics section
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
1 manual in the MyPros+ library documents this code for Coleman furnace.
Models covered by the manuals that document this code
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