State GPH-90N - Manual (Page 17)

Service Instructions
0610 17 319172-000 Rev. 00
GAS WATER HEATERS
OUTLET THERMISTOR REPLACEMENT
This instruction has been prepared to acquaint you with the service of your gas-fi red water heater. It is your responsibility to
ensure that your water heater is properly installed and maintained.
Failure to follow the instructions in this service instruction sheet may result in serious bodily injury and/or property
damage. Thoroughly read and understand all instructions before you attempt to install, operate or service this heater.
Maintenance and service requires trade knowledge in the areas of plumbing, electricity and gas. If you lack these skills or
have diffi culty understanding these instructions you should not proceed. Enlist the help of a qualifi ed service technician to
service this water heater.
To Remove:
Disconnect the electrical power to the water heater.
Close the shutoff valve on the gas supply line to the
water heater.
Close the shutoff valves on both the hot-water and cold-
water lines.
Unlock the door by rotating the lock counter-clockwise
with a wide, slot screwdriver.
Release the top and bottom door pins by prying the pins
out, using a small screwdriver.
Open the door (the door remains fastened to the left
side panel).
Remove the ten screws that secure the front cover of
the heat engine. Remove the front cover of the Heat
Engine.
Carefully disconnect the wire harness plug leading to
thermistor.
Drain the tank following the instructions in the “Draining
The Tank” section in the Operating Manual.
Remove the two screws from the fl ange on the return
fi tting and remove the clamp.
Remove the thermistor.
To Install:
Secure the new thermistor in place with the clamp and
two screws.
Open the shutoff valves on both the hot-water and cold-
water lines.
Fill the tank with water. Check for leaks and repair as
required.
Carefully reconnect the wiring harness plug to the
thermistor.
Reassemble the front cover of the Heat Engine.
Close and lock the door.
Open the shutoff valve on the gas supply line to the
water heater.
Reconnect the electrical power to the water heater.
Restart the water heater following the “Lighting
Instructions” found in the Operating Manual.
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Access To
Door Pins
Door
Lock