Pentair MiniMax NT LN installation manual Troubleshooting General, Service Checks-Ignitionmodule

Section V. Troubleshooting 29

TROUBLESHOOTING (GENERAL)

Possible Cause	Remedy
Heater will not come on
	Check if electrical connections are
Automatic ignition system fails	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
SERVICE CHECKS—IGNITION MODULE
	Symptom		Cause/Cure
	1.	Dead	A. Miswired
			B. Transformer bad
			C.	Fuse/Circuit breaker bad
			D.	Bad control
	2.	Thermostat on—no ignition	A.	Miswired
			B. Bad thermostat no voltage at terminal
	3.	Valve on, no ignition	A.	Defective ignitor
			B.	Miswired
			C. Bad control (check voltage at ignitor)
	4.	Ignitor on, no valve action	A.	Valve coil open
			B. Open valve wire
			C. Bad control (check voltage)
	5.	Flame okay during	A. Bad flame sensor
		Try For Ignition (TFI),	B.	Bad wires
		no flame sense (after TFI)	C.	Poor ground at burner
			D. Poor flame (check flame current)

Rev. E 4-19-05 P/N 472089