Troubleshooting
Motor doesn’t start Check MOA module to see if in AUTO (green light if on/red light if
fuse is blown)
Check blower door switch
Check smoke/ammonia detectors (if applicable)
Check end switch on OA dampers (if applicable)
Check fuses
Check overloads
Check power to coil on starter
Check power from starter to motor
Motor starts but quits shortly after. Check fan belts
Check tubes to airow switch to be clean
Check power through air ow switch
Check rotation of fan
Cooling doesn’t come on Check MOA module to see if in AUTO (green light if on/red light if
fuse is blown)
Check setpoint for cooling
Check OA lockout setpoint (lockout should be below OA Temp)
Check power to valve
Steam valve doesn’t modulate Check setpoint for heat
Check OA lockout setpoint (lockout should be above OA Temp)
Check output for steam valve
Direct-red burner doesn’t light Check setpoint for heat
Check OA lockout setpoint (lockout should be above OA Temp)
Check MOA module to see if in AUTO ( green light if on/red light if
fuse is blown)
Check burner safety circuit. Eg. High gas pressure switch, Low gas
pressure switch, high temp limit, burner door switch
Check to make sure OUTSIDE air dampers are open and RETURN
dampers are shut
Check burner airow switch
Check and clean UV scanner
Check and gap pilot assembly (3/16" gap) Check gas supply
Indirect-red burner doesn’t light Check setpoint for heat
Check OA lockout setpoint (lockout should be about OA Temp)
Check MOA module to see if in AUTO (green light if on / red light if
fuse is blown)
Check blower on burner
Check lockout alarm on Honeywell control
Check burner airow switch
Check low re end switch on burner damper motor
Check spark rod and ame rod
Check pilot assembly
Exhaust fan doesn’t start Check MOA module to see if in AUTO ( green light if on / red light if
fuse is blown)
Check disconnect switch on fan
Check overload
Check power to and from starter
Check damper end switch ( if applicable )
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