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Troubleshooting - General
Possible Cause
Heater will not come on
Automatic ignition system fails
Pump not running
Pump air locked
Filter dirty
Pump strainer clogged
Defective wiring or connection
Defective pressure switch
Defective gas controls
On-Off switch in "OFF" position
Heater Short Cycling (Rapid On and Off Operation)
Insufficient water flow
Defective wiring
Defective flow valve or out of adjustment
Defective hi-limit and/or thermostat
Heater Makes Knocking Noises,
Make sure all valves on system are open
Heater operating after pump has shut off
Heater exchanger scaled
SERVICE CHECKS—
IGNITION MODULE
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Remedy
Check if electrical connections are
correct and securely fastened –
If YES, call serviceperson.
Place pump in operation
Check for leaks
Clean filter
Clean strainer
Repair or replace wires
Replace switch
Call serviceperson
Turn switch to "ON"
Clean filter and pump strainer
Repair or replace wiring
Call serviceperson
Call serviceperson
Shut off gas supply and call serviceperson
Shut off gas supply and call serviceperson
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25
P/N 472089
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Table of Contents
Troubleshooting
