Bradford-White Corp EF Section XI Troubleshooting Guide, Combustion System Inspection

COMBUSTION SYSTEM INSPECTION

Inspect the operation of the combustion system monthly. Use the following procedure to inspect the combustion system.

1.Turn off the main power switch of the water heater.

2.Adjust the thermostat to the Min. setting.

3.Remove the top of the combustion surround by unlatching it.

4.While observing the ignition module, turn on the main power switch.

5.Adjust thermostat to the Max. setting.

6.Watch the LED’s light as the controller goes through the S-OP as previously described.

7.Upon ignition, observe the main burner flame.

8.Readjust thermostat to previous setting.

9.Replace combustion surround top and latch it securely in place.

WARNING

Do not run out of propane gas. Damage to the water heater may occur.

		SECTION XI: TROUBLESHOOTING GUIDE
Main power	∙	Make sure that water heater is plugged in.
light is not lit.	∙	When the switch is on, is there 120VAC between L1 and N on the terminal block? If not, then check for loose wire
	∙	connections on the "Power Switch Wire Harness." If connections are ok, then replace the switch.
		If there is voltage between L1 and N then the light on the switch is burnt out. Replace switch
Ignition module	∙	Check for 120 VAC at the ignition module on "120 VAC IN." If there is voltage, then check the secondary (24 volt
"Power" LED is		terminals) voltage across the transformer as previously described. If no voltage from the secondary plug from the
not lit		transformer, replace the transformer or wire harness. If the control has 120 and 24 volt input, replace the control.
Blower does not	∙	Unplug the wire harness to the blower and check the pins for 120 volts. If no voltage, and the ignition control has 120
energize		volts, the control may be defective, call tech support. If 120 volts is present to the blower, make sure the pins are making
		good contact. Replace blower if connections are good and 120 volts is present to blower.
Ignitor does not	∙	Make sure pressure switch contacts are closed (24 volts from pressure switch harness to ground). Is there voltage to the
glow		"Hot Surface Ignitor"? Check for 120VAC to the ignitor from the ignition module when the ignition LED is lit. If no
	∙	voltage to the ignitor, replace ignition control.
		Check the resistance value across the "Hot Surface Ignitor?" If over 120 ohms, then replace hot surface ignitor.
Main valve does	∙	Put your hand on the gas valve. When the "Valve" LED lights on the ignition module, can you feel it energize? If not,
not turn on
		then check the voltages at the ignition module across pins 2 (blue) and 5 (brown) on the plug "CONTROL". If there is 24
		VAC across these pins, then check to see if the "Rectifier Harness” (or gas valve harness on 100 gallon 399,999 BTU/hr
	∙	(117.2 kw) model) is secure. If it is secure, then replace the "Gas Valve".
		If you can feel the gas valve energize, check to make sure the main gas supply is not in the off position.
Burner Flame	∙	Is there minimum gas supplied to water heater as stated on the rating plate? If not, then increase the supply pressure to the
keeps going out	∙	water heater (4.5 min. - 14 max.).
		Measure the microAmps through the flame sensor using a multimeter. Is there at least 4 microAmps? If not, then replace
		the "Flame Sensor" or flame sensor wire.
Thermostat does	∙	Make sure that the temperature of the tank is cool.
not call for heat	∙	If the thermostat does not call for heat, then check the PRIMARY voltage across the "Transformer". If there is voltage
	∙	across the PRIMARY, then check the voltage across the SECONDARY leads of the "Transformer".
		Install a jumper wire from N.O. terminal to the COM terminal on the "Thermostat PC Board." If the thermostat calls for
		heat after installing a jumper wire then check the "Thermostat Sensor Probe" leads for proper resistance with an OHM
	∙	meter (See appendix A).
		If sensor reading is not correct, replace "Thermostat Sensor Probe."
	∙	If the sensor readings are correct, then check "Potentiometer" for the proper resistance. If the readings are correct, then
		replace the "Thermostat PC Board"; If readings are not correct replace the "Potentiometer."

Manufactured under one or more of the following U.S. Patents: RE.34,534; B1 5,341,770; 4,416,222; 4,628,184; 4,669,448; 4,672,919; 4,808,356; 4,829,983; 4,861,968; 4,904,428; 5,000,893; 5,023,031; 5,052,346; 5,081,696; 5,092,519; 5,115,767; 5,199,385; 5,277,171; 5,372,185; 5,485,879; 5,574,822; 5,596,952; 5,660,165; 5,682,666; 5,761,379; 5,943,984; 5,954,492; 5,988,117; 6,142,216; 6,684,821; 7,063,132; 7,007,748;

Other U.S. and Foreign patent applications pending. Current Canadian Patents: 1,272,914; 1,280,043; 1,289,832; 2,045,862; 2,092,105; 2,107,012; 2,108,186; 2,112,515

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