Board 13 - Unit Heater
Electrical Ratings
BM: 5.8 FLA
IDM: 4.4 FLA
Key
BM
Blower Motor
C
24 VAC Common
G
24 VAC fan circuit
GV
Gas Valve
GND
Ground
IDM
Induced Draft Motor
L1
Line 1
N
Neutral
R
24 VAC supply circuit
S10
Switch - Limit
S18
Switch - combustion air blower proving
S43
low gas pressure
T1
Transformer 1
W
24 VAC heating circuit
Submit Your Diagnosis
Blower Motor seized
Blower Motor windings grounded
Blower Motor windings open
Combustion Air Proving Switch open
Control Board locked out / faulty
Excessive gas pressure
Gas Valve Coil open
Gas Valve faulty
Induced Draft Motor grounded
Induced Draft Motor seized
Induced Draft Motor windings open
Limit open
No Faults
No gas pressure
No power
T-Stat not calling
Transformer open
