Honeywell Gas Water Heater, 238-47969-00A instruction manual Diagnostics for Honeywell Control

DIAGNOSTICS FOR HONEYWELL CONTROL

LED Status	Control Status		Probable Cause
		1. Gas valve is functioning
None (LED not on or	Millivolt power is not		normally
flashing)	present. Light pilot.	2.	Gas valve is not powered.
			Light pilot
	If set point knob is in	Gas valve is powered and waiting
		for the set point knob to be turned
One flash and three	"PILOT" position then pilot
second pause.	flame is detected. (no	to a water temperature setting. If
		the set point knob is at desired
	faults).
		setting the thermostat is satisfied.
LED strobe (two quick	Thermostat calling for heat
flashes) and three second		Water heater operating normally.
	(no faults)
pause
	Set point knob has been	Set point knob was recently turned
		to "OFF" position. Wait until LED
LED on continuously.	recently turned to the
		goes out before attempting to
	"OFF" position.
		relight
Two flashes and three	Weak pilot flame detected.	1.	Unstable pilot.
	System will reset when	2.	Pilot tube blocked or
second pause.
	pilot flame is sufficient.		restricted.
Three flashes and three	Insufficient water heating.	1.	Temperature sensor out of
second pause.	System will reset.		calibration.
		2.	Possible short.
Four flashes and three	Excessive tank	1.	Temperature sensor out of
	temperature. System must		calibration.
second pause.
	be reset.	2.	Faulty gas valve.
		1.	Damage to the temperature
			wire.
		2.	Temperature sensor
			resistance out of range.
		3.	Replace temperature sensor.
		4.	If temperature sensor
Five flashes and three			replacement does not correct
	Temperature sensor fault.		the problem; Verify control is
second pause.
			not wet or physically damaged
		5.	Turn set point knob to "OFF"
			position. Turn set point knob
			to "PILOT" position and light
			pilot.
		6.	Replace gas valve if five flash
			error persists.

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