Pentair 300, 250 Service CHECKS-IGNITION Module, Flame Sensor Current Check, Service Checks

Troubleshooting & Service 31

SERVICE CHECKS—IGNITION MODULE

Service Checks

Symptom		Cause/Cure
1.	Dead	A. Miswired
		B. Transformer bad
		C. Fuse/Circuit breaker bad
		D.	Bad control (check LED for steady on)
2.	Thermostat on—no ignition	A.	Miswired
		B. Bad thermostat no voltage at terminal W
3.	Valve on, no ignitor	A.	Defective ignitor
		B.	Miswired
		C. Bad control (check voltage at ignitor)
4.	Ignitor on, no valve	A.	Valve coil open
		B. Open valve wire
		C. Bad control (check voltage between V1 & V2)
5.	Flame okay during TFI,	A.	Bad ignitor
	no flame sense (after TFI)	B.	Bad S1 wire
		C. Poor ground at burner
		D.	Poor flame (check flame current)

FLAME SENSOR CURRENT CHECK

MULTI-PURPOSE METER

USE MICROAMP SCALE

RED (+)

Figure 25. BLACK (-)

2465H MODULE

SERVICE CHECKS

Flame current is the current which passes through the flame from the sensor to ground. The minimum flame current necessary to keep the system from lockout is 0.7 microamps. To measure flame current, connect an analog DC microammeter to the FC1/FC2 terminals per figure. Meter should read 0.7 µA or higher. If meter reads below “0” on scale, meter leads are reversed. Disconnect power and reconnect meter leads for proper polarity.

Rev. C 11-1-01 P/N 471593