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Check ground connection.
Install or replace.
Check for spark
1. Spark stays on while pilot is on.
• Check for loose ignition wire.
• Check for poor ground.
• Check flame coverage of both
spark and grounded electrodes.
• If okay replace ignition module
2. Spark goes out and pilot stays on:
• Check voltage at MV; MV/PV
terminals.
- Voltage @ 24 VAC - replace
main gas valve.
- Voltage not at 24 VAC - replace
module.
Voltage should read 24 VAC.
If valve does not open:
1st operator - replace valve
2nd operator- replace operator
assembly.
Check dial setting on valve and set to
meet requirements.
Unit keeps cycling on electrical limits -
adjust temperature setting on valve.
Pump not primed.
Pump rotation wrong direction.
• Check motor leads- reverse
to obtain proper rotation.
Speed too low-
• Check for proper voltage at
motor.
Total head too high.
Check for
• Air leaks in suction line.
• Clogged impeller.
• Strainer clogged.
• Excessive suction lift.
• Insufficient positive suction
head.
Total head greater than design.
Worn impeller.
Misaligned or bent shaft,
Sagging motor mounts.
Check for air leaks.
Check water seal in stuffing box.
Check suction lift and pump design
curves.
Check head on pump if too low
throttle discharge.
Check alignment. Correct if found.
Check for vapor binding and reduce
temperature to meet design.
Check shaft and bearings.
Check piping for correct alignment
and support.
Main burner cyles.
Intermittent Ignition Module
• Poor ground connection
Main burners do not light.
3. Mechanical Modulating Valve.
4. Failure to pump.
5. Pump capacity insufficient.
6. Rapid coupling wear.
7. Pump loses prime.
8. Overload.
9. Mechanical noise.
Electrical continued
3. Pilot lights -
4. Pilot lights -
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