Why does the combustion fan motor run all the time with no call for heat? Relay Harness Kit (KIT15855)
- Disconnect power from unit.
- Pull the orange and black motor leads from the ignition control and isolate leads.
- Reapply power to unit.
- If combustion motor still runs, replace combustion fan assembly (motor is shorted internally).
If combustion motor does not run, verify contacts on ignition control.
See the bottom of the document for KIT15855 instructions download.