Transformer Replacement Procedure
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
Step 4. Refer to ignition module illustration below, Disconnect wire harness P1 labeled
“PRIMARY” and P2 labeled “SECONDARY” from ignition module.
Step 5. Disconnect secondary leads (blue &
yellow wire) from thermostat board.
Note the blue wire is connected to
24 volt “HOT” terminal. (see photo 28)
Step 3
Disconnect harness
“P1” & “P2”
from ignition module
Step 6. Remove the 2 screws ( short Phillips screw driver) holding the transformer in place and
remove transformer from control panel. (see photo 29)
Step 6
Remove transformer
mounting screws
Step 7. Install new transformer and secure in
place with screws from step 6.
Step 8. Reconnect wire harness P1 & P2,
connections are non-interchangeable
to insure proper reconnection.
Step 5
Disconnect blue & yellow wire from
thermostat board. Note blue wire is
connected to 24 volt “HOT” terminal.
Step 9. Reconnect blue & yellow wire leading from the
P2 connection on ignition module to
thermostat board. Note the blue wire must
connect to the 24 volt “HOT” terminal.
(see photo 30)
24 volt common,
yellow wire connection
24 volt Hot,
blue wire connection
Ignition module
Thermostat
board
Thermostat
board
28
29
30
Page 35
Service Procedure EF-X
Transformer Replacement
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (Unplug) water heater
from 120 Volt power source.
Step 3. Un-latch & remove surround cover from
top of water heater.
Step 10. Restore 120 volt power supply to water heater and
confirm proper operation following the lighting
instructions on the lighting instruction label or the
lighting instruction located in the installation and
operating instruction manual.
Step 11. Replace surround cover on top of water heater.
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