Pentair 75 - Manual (Page 20)

20
P/N 471105 Rev. E 5-16-01
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 serviceman.
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 serviceman
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 serviceman
Defective hi-limit and/or thermostat Call serviceman
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 serviceman
Heater exchanger scaled Shut off gas supply and call serviceman