22
P/N 470880
Rev. K 5-31-06
TROUBLESHOOTING - GENERAL
Possible Cause
Remedy
Heater will not come on
Automatic ignition system fails
Check if electrical connections are
correct and securely fastened –
If YES, call service person.
Pump not running
Place pump in operation
Pump air locked
Check for leaks
Filter dirty
Clean filter
Pump strainer clogged
Clean strainer
Defective wiring or connection
Repair or replace wires
Defective pressure switch
Replace Switch
Defective gas controls
Call service person
On-Off switch in "OFF" position
Turn switch to "ON"
Heater Short Cycling
(Rapid On and Off Operation)
Insufficient water flow
Clean filter and pump strainer
Defective wiring
Repair or replace wiring
Defective or stuck by-pass valve
Call service person
Defective hi-limit and/or thermostat
Call service person
Manual By-Pass Valve not properly set
Adjust By-Pass Valve, see page 18
Heater Makes Knocking Noises,
Make sure all valves on systems are open
Heater operating after pump has shut off
Shut off gas supply and call service person
Heater exchanger scaled
Shut off gas supply and call service person