State GS6 75 URRBS - Manual (Page 17)

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Restart the water heater as directed under "Operating Your Water
Heater." See the repair parts illustration for anode rod location.
Figure 9
SERVICE AND REPAIR
The water heater requires no special care other than the normal
maintenance as noted above. If you are having a problem with your
water heater, before calling for service please refer to the following
TROUBLESHOOTING sections. If service becomes necessary,
contact your dealer, installer or an authorized service agent. Do not
attempt to repair the water heater yourself. Any work performed by
unauthorized personnel may void the warranty.
TROUBLESHOOTING
Water heaters may exhibit problems that are unrelated to a malfunction
of the water heater itself. The following information and tables may
serve to answer your question about a problem that you are having
without having to call a service agent.
For your safety, water heater service should be performed only
by a qualifi ed service technician. Read the GENERAL SAFETY
INFORMATION section fi rst.
WATER HEATING CYCLE
(GAS AND ELECTRIC POWER ARE ON,“OFF/ON” SWITCH IS
ON)
1) CALLS FOR HEAT
A) THERMOSTAT SENSES NEED FOR HEATING WATER
B) CONTACTS CLOSE IN THERMOSTAT, POWER (115 VAC)
FLOWS TO BLOWER MOTOR
2) BLOWER MOTOR ROTATES BLOWER WHEEL
A) BLOWER WHEEL SPEED INCREASES
B) WHEEL SPEED INCREASES, AIR PRESSURE SWITCH
CONTACTS CLOSE
3) 120 VAC FLOWS TO HOT SURFACE IGNITER
NOTE: THE CONTROL MODULE ON THIS UNIT WILL TRY A
MAXIMUM OF THREE TIMES TO LIGHT THE UNIT. CYCLE CAN
BE RESTARTED AT ANY TIME BY TURNING OFF SWITCH AND
THEN TURNING BACK ON. IF UNIT HAS GONE THROUGH THREE
CYCLES AND DID NOT LIGHT, THEN REPAIRMAN SHOULD BE
CALLED TO CHECK OPERATION OF HEATER.
4) MAIN BURNER IGNITES
A) GAS FLOWS TO MAIN BURNER PORTS AND IS IGNITED
5) GAS VALVE SENSES BURNER FLAME
6) BURNER HEATS WATER
A) BURNER HEATS WATER TO THERMOSTAT SETTING
B) CONTACTS IN THERMOSTAT OPEN,
C) CYCLE IS COMPLETED