White Rodgers 927, 922, 921, 37E73A-918 Troubleshooting, Error Indication Check, Repair, or Replace

TROUBLESHOOTING

The troubleshooting charts cover the error codes that the Intelli-Vent™ control can recognize, the potential cause, and those actions that may help repair the problem. The water heater manufacturer’s troubleshooting procedure should be consulted before attempting to repair the appliance. The wa- ter heater manufacturer’s instructions take priority over the instructions here.

If for any reason you question your ability, or feel any doubt about your ability to perform any of the troubleshooting pro- cedures or repairs recommended. STOP! Contact a trained and qualified service professional to repair the water heater.

To troubleshoot the system using the error code indicators:

1.Check that the system is currently active and calling for a request for heat. You can initiate a call for heat by either drawing hot water from a nearby faucet or raising the tem-

perature setting (see section “Temperature Regulation”). If you have noted an error code from a previous heating cycle, this step is not necessary, and you may proceed with the next step.

2.Refer to the troubleshooting charts on below to find the error code that is displayed. Check and repair those items recommended.

3.Once the repair is complete, again initiate a call for heat, and observe that the ignition sequence complies with that shown on page 7.

4.After the water heater repair is complete, return the water heater temperature setting to the original temperature. If for any reason you cannot remember the original setting, return the setting to the 120oF setpoint. See the section “Temperature Regulation” for assistance in setting the wa- ter temperature setting.

			Error	Indication	Check, Repair, or Replace
A	B	C	1	An open earth ground cir-	1. Check that the earth ground conductor is properly
				cuit to the ignition system	connected at the fuse box or breaker panel and the
					water heater.
					2. Check that the grounding conductors on the water
					heater are properly connected and secure.
A	B	C	2	The self diagnostic test	1. Check for proper connection of the line neutral and
				detected a wiring error or	line hot wires.
				a high resistance to earth	2. Check that the appliance is securely connected to
				ground	earth ground.
A	B	C	3	The pressure switch re-	1. The pressure switch wiring is incorrect.
				mained closed longer that	2. The pressure switch is defective and must be
				5 seconds after the call for	replaced.
				heat began.
A	B	C	4	The pressure switch re-	1. The pressure switch wiring is incorrect.
				mained open longer than 5	2. The pressure switch tubing is not connected cor-
				seconds after the combus-	rectly.
				tion blower was energized	3. Obstructions or restrictions in the water heater air
					intake or exhaust flue.

A	B	C	5	The self diagnostic test has				1. Check that all wiring is correct and secure.
				detected an error in the Hot				2. Disconnect the ignitor and measure the ignitor re-
				Surface Ignitor circuit.				sistance with an accurate ohmmeter between pins
								1 and 2. Resistance should be between 11.5 and
								18.8 ohms. If the reading is incorrect, replace the
								Hot Surface Ignitor.
								3. If the above checks are good, replace the INTELLI-
				1	2	3	4	VENT™ control.

A	B	C	6	The maximum number of	1. Check if the gas supply is off or too low to operate.
				ignition retries or recycle	2. Check that the flame sense rod to see that it is
				has been reached and the	located properly and free from contamination.
				system is in lockout	Reposition the flame sense rod or lightly clean with
					an abrasive cloth.
					3. The Hot Surface Ignitor may not be positioned cor-
					rectly. Reposition as necessary.
					4. The Hot Surface Ignitor and Flame Sense Rod
					wired correctly and in good working condition.
					Repair as required.
					5. Low voltage to the water heater. Check and repair.

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