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— It is possible that the high limit (E.C.O.) has functioned to shut
off the appliance. See FEATURES — Water Temperature
Control for reset procedure. Contact your serviceman 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:
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 is in burner flame)
8 flashes Check ignitor
Table 10.
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 the “OPERATIONAL
CHECKLIST” and the “SEQUENCE OF OPERATION” to
troubleshoot the appliance.
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
servicemen, 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.
ELECTRICAL SERVICING
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN
SERVICING CONTROLS. WIRING ERRORS CAN CAUSE
IMPROPER AND DANGEROUS OPERATION.
VERIFY PROPER OPERATION AFTER SERVICING.