Thermo Pride Gas/Propane Furnace Mobile Home CMC1 - Manual (Page 54)

All installations and services must be performed by qualified service personnel.
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If the sensed failure is in the system (external to the control), the LED will flash in the
following flash-pause sequences to indicate failure status (each flash will last
approximately 0.25 seconds, and each pause will last approximately 2 seconds).
1 flash, then pause
system locked
2 flashes, then pause pressure switch stuck closed
3 flashes, then pause pressure switch stuck open
4 flashes, then pause open high limit switch
6 flashes, then pause 115 volt AC power reversed
7 flashes, then pause low flame sense signal
8 flashes, then pause check ignitor or improper grounding
Continuous flashing Flame has been sensed when
(no pause) no flame should be present
(no call for heat)
The LED will also flash once at power-up.
: Power must be disconnected before servicing.