Bradford-White Corp U4TW60T*FRN Troubleshooting, Page, LED Status, Control Status, Probable Cause

Troubleshooting

Observe the green LED on the water heater gas con- trol. Error codes are displayed with a 3 second pause before repeating. Once the error code is known, check and repair the water heater, as recommended in the table below.

Green LED

LED Status	Control Status		Probable Cause	Service Procedure
None (LED		Control power switch in "OFF"
not on or	No electrical power	position.		Turn Power On
flashing)		Supply voltage interrupted.
One short	Stand-by mode,	Temperature demand is satisfied
flash every	Thermostat is			Normal operation
four seconds	satisfied (no faults)	(no call for heat)
Alternates
bright and	Thermostat calling	Tank temperature below		Normal operation
dim	for heat (no fault)	setpoint of thermostat
(heartbeat)
		1.	Unstable pilot
		2.	Pilot tube blocked or restricted	1. See Burner Inspection on
Short flash	Weak pilot signal	3.	Oxidation build-up on pilot	page 20
once every		electrode		2-4. See Pilot Inspection,
second	on last call for heat	4.	Wire damage to pilot	Testing and Replacement on
		assembly or bad connection at		page 22
		gas control
		1.	Pressure switch tubing kinked
Two flashes,	Pressure switch not	or blocked		1-3. See Pressure Switch
three second	working-closed	2.	Blocked pressure tap on
				Testing on page 25
pause	position	switch or blower
		3.	Faulty pressure switch
		1.	Vent blockage or improper
		vent configuration
		2.	Pressure switch tubing kinked	1. Check vent or vent tables
Three	Pressure switch or	or blocked		2-3. See Pressure Switch
flashes,	blower temperature	3.	Faulty pressure switch	Testing on page 25
three second	switch not working-	4.	Blower not spinning up to	4. See Blower Testing on
pause	open position	speed		page 28
		5.	Blower temperature or	5-6. See blower Temperature
		exhaust temperature too high		Switch Testing on page 31
		6.	Faulty blower temperature
		switch
Four flashes,	Excessive tank	1.	Thermal well sensor out of	1. Test Gas Control & Thermal
	temperature,			Well
three second		calibration
	system must be			2. Replace gas control if
pause		2.	Faulty gas control
	reset			necessary
Five flashes,	False pilot flame
three second		Pilot valve stuck in open position		Replace gas control
	present
pause

Page 17

17