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Large Unit Heater
25
Operating Instructions and Owner’s Manual
Symptom Possible Cause Corrective Action
The burners do not stay lit 1. The burners light and then shut off immediately (within
1-2 seconds).
2. The burner does not stay on for approximately 8-10
seconds, and then shut off.
3. The heater is not properly grounded. The heater’s polarity
is not correct.
4. Reading the micro-Amp of flame sensor circuit with a
micro ammeter, it is greater than 0.5 micro-Amps. NOTE:
Meter must be able to set and be connected properly to
read the very low current value.
5. Reading the micro-Amp of flame sensor circuit with a
micro ammeter, it is not greater than 0.5 micro-Amps.
1. Check inlet pressure and limit switches.
2. Check control board for flash codes.
Consult factory.
3. Correct grounding or fix polarity.
4. Check control board flash codes. Replace
ignition module.
5. Replace control board.
The air motor fan does
not turn on approx. 30
seconds after ignition
1. The control board does not send 120 VAC to the air
movement fan after approx. 30 seconds after ignition and
if contact relay fan control is closed.
2. The control board does not send 120 VAC to the air
movement fan after approx. 30 seconds after ignition and
if contact relay fan control is open and there isn’t 24VAC
on relay fan control.
3. The control board does not send 120 VAC to the air
movement fan after approx. 30 seconds after ignition and
if contact relay fan control is open and there is 24VAC on
relay fan control.
4. The motor is dirty, obstructed, or damaged, inhibiting
rotation.
5. Motor starter capacitor damaged.
1. Verify wires are not damaged.
2. Check if switch start circulation is closed.
3. Replace relay.
4. Clean fan, remove obstruction, or replace
damaged parts.
5. Replace or repair.
The heater does not stay
on until the call for heat
ends
1. The heater can shut down or stay on due to:
• Limit switch opening.
• Pressure switch opening.
• Improper grounding.
• Faulty control device.
• High winds.
• Taking combustion air from the attic.
• Dirty environment.
• Fluctuating gas pressure.
If no leak is found, combination control is faulty and must be replaced before putting appliance back in service.
# OF FLASHES LED DIAGNOSTIC CODES
AT ON every 3 sec Normal Operation
1 FLASH Self Test
1 FLASH every 3 sec Airflow fault
2 FLASHES every 3 sec Flame - No call for heat
3 FLASHES every 3 sec Ignition lockout
4 FLASHES every 3 sec Control Fault
TABLE 10: Led Diagnostic Codes
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