Troubleshooting Guide - Nortec GH Series Instaliation, User & Maintenance Manual

TROUBLESHOOTING GUIDE
Service Checks
Symptom Cause/Cure
On-off Switch Energized, Humidistat calling for - No power to appliance. Check circuit breaker. Check disconnect switch.
operation. Unit does not operate.
Unit energized/Ignition module okay. Blower
NOT running.
Power to unit on, humidistat on, indicator lights
on except humidity demand.
Humidistat on. No blower output
Pressure switch input okay but no trial for
ignition after purge delay.
Valve activates. No ignition. LED displays 3
flashes.
- Defective Transformer. Check secondary voltage. If no 24 volts, replace
transformer if breaker is not blown.
- Low voltage breaker blown. Check breaker (located on side of transformer).
If breaker blown, reset breaker.
- Ignition module locked out. Check LED diagnostic light for failure
identification. See Fault Conditions for identification of fault codes.
- Loose wire(s). Check wiring connection(s).
- Defective blower. Replace blower.
Miswired.
Low float switch stuck or defective. Check continuity of float switch and
inspect floats. Clean floats if scaled up; replace if defective.
Fuse/Circuit breaker bad.
Bad control. Check LED for steady on.
Miswired.
24VDC power supply defective or fuse blown. Check fuse on power supply.
Miswired. Check PSW terminal voltage.
Bad control. Check LED for steady on.
- Defective hot surface igniter.
Miswired.
Bad Control.
Igniter on. No valve operation. LED displays 3 _
flashes
Valve coil open.
Open valve wire.
Bad control. Check voltage between MV1 & ground.
Flame okay during TFI. No flame sense (after - Defective flame sensor.
TFI). LED displays 3 flashes.
- Bad S2 wire.
- Poor ground at burner.
- L 1 and neutral wires to unit reversed.
- Poor flame. Check flame current.
Flame with no call for heat.
- Stuck valve. Check LED for 2 flashes.
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