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P
roblem
1.
Heater will not operate:
2.
Pilot burner will not light
TROUBLE SHOOTING
P
ossible Cause
Electrical:
•
Main power
•
Manual reset switch.
•
Operating controller.
•
Controller in-operative.
•
Flow Switch
Mechanical:
•
Gas Line
•
Plugged bleedline on pressure
regulator, gas valves, etc.
•
Broken pump coupler.
•
Gas valve will not open:
1.
Diaphram type.
2.
Motorized type
Note: Actuator is not field repairable. If problem is other than switch(es)
replace.
3.
Combination type
Intermittent Ignition Module
(IID)
36
Action
Check circuit breaker, fuses, etc.
Power at boiler control switch should
be 115 volts.
Check all controls. If reset is tripped
determine reason and correct.
Check power to all controls with
voltmeter. Adjust to desired operat-
ing temperatures.
Remove sensor. Check for immer-
sion or sensing.
Replace if faulty.
Check pump for operation.
Open shutoff cock(s)
Loosen bleed line and clean.
Check reason for failure.
Inspect bearing assembly, shaft and
impeller.
Replace coupling.
Check bleed line. Clean. Check
solenoid. Replace if defective.
Check auxiliary switches.
a.
Auxiliary switch;
b.
Valve closed switch.
Power should be 115 volts.
Check controller.
Check power to 25 VAC input
terminal
1.
If 25 VAC:
- Check for 1/8" spark @ pilot.
a. Spark ok:
• Check gas supply.
• Burner orifice.
• Dampness @ electrode
or high tension wire.
• Check for 25 VAC @
PV; MV/PV terminals.
1. Voltage @ 25 VAC
- Replace pilot valve.
2. Voltage not @ 25 VAC
- Replace module.
2.
No 25 VAC @ input terminal.
- Check transformer output.
a. 25 VAC
• Check limit circuit.
b. No 25 VAC
• Replace transformer.
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