Ignition Module System

SERVICE

The installer may be able to observe and correct certain problems which may arise when the unit is put into operation. HOWEVER, it is recommended that only qualified service agents, using appropriate test equipment, be allowed to service the heater.

As preliminary step, check wiring against diagram, check for grounded, broken or loose wires. Check all wire ends to be sure that they are making good contact.

Before calling your service agent, the following checklist should be examined to eliminate obvious problems from those requiring replacement or servicing.

•Check that “main manual gas shutoff valve” is fully open and that gas service has not been interrupted.

•Check that after following the appliance OPERATING INSTRUCTIONS, the “Top Knob” of the appliance gas valve is in “ON” position.

•Check electrical supply to the appliance for possible blown (or tripped) fusing or power interruption. Also check the 3 amp fuse on the front of the digital thermostat (Fig. 2).

•Is the water temperature in tank below the thermostat dial setting on the appliance thermostat (calling for heat)?

•It is possible that the high limit (E.C.O.) has functioned to shut off the appliance. See High Limit page 7 - High Limit Switch for reset procedure. Contact your service agent if limit continues to function to shut off appliance.

System Diagnostics

Your water heater is equipped with an ignition module that incorporates a diagnostic system to assist in troubleshooting the appliance. The indicator codes on the ignition module are as follows:

TABLE 11:

1	FLASH	System lockout (retries or cycles exceeded)

2	FLASHES	Pressure switch stuck close

3	FLASHES	Pressure switch stuck open

4	FLASHES	Open on high temperature limit switch (eco)

6	FLASHES	115 volt AC power reversed (check polarity)

7	FLASHES	Low flame sense signal (make sure flame sensor
7	FLASHES	is in burner flame)
8	FLASHES	Check igniter

continuous flash -> continuous flame sensed > 5 seconds without gas valve

continuous on -> internal control failure - replace ignition control module.

Use this diagnostic system in conjunction with “OPERATIONAL CHECKLIST” and the “SEQUENCE OF OPERATION” to troubleshoot the appliance.

Electrical Servicing

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION.

VERIFY PROPER OPERATION AFTER SERVICING.