State GPH-90N - Manual (Page 25)

Service Instructions
0610 25 319172-000 Rev. 00
GAS WATER HEATERS
TRANSFORMER 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.
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.
Remove the two screws securing the circuit board and
partially extract it.
Carefully disconnect the Transformer wiring harness
plugs from the circuit board.
Remove the four screws securing the Transformer to the
Heat Engine Cabinet.
Remove the Transformer.
To Install:
Secure the new Transformer to the Heat Engine Cabinet
with the four screws.
Carefully reconnect the Transformer wiring harness plugs
to the circuit board.
Slide the circuit board into its proper position and secure
using the two screws.
Reassemble the front cover of the Heat Engine.
Close and lock the door.
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