Pentair NT Standard Series installation manual Troubleshooting General

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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 serviceperson.
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 serviceperson
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 flow valve or out of adjustment	Call serviceperson
Defective hi-limit and/or thermostat	Call serviceperson

Heater Makes Knocking Noises,

Make sure all valves on system are open

Heater operating after pump has shut off	Shut off gas supply and call serviceperson
Heater exchanger scaled	Shut off gas supply and call serviceperson

Rev. A 1-2-02 P/N 472032