Control Module Removal/Replacement - A.O. Smith GPVL-50 Service Handbook

CONTROL MODULE REMOVAL/REPLACEMENT

ELECTRONIC CONTROL MODULE
Important: Do not remove the entire gas control assembly
from the water heater.
Important: Use only factory authorized replacement parts.
If you lack the necessary skills to properly perform the
installation, you should not proceed, but get help from a
qualifi ed service technician.
Tools required:
•
T15 Torx screwdriver
•
Flat-blade screwdriver
Removing Electronic Control Module
1. Set the gas control valve/thermostat to its lowest setting
by turning the knob counter-clockwise to the VAC point
(see Figure 20).
2. Turn gas control switch to the "OFF" position and turn
off the gas supply to the unit (see Figure 20).
3. Disconnect the electrical power to the water heater
from the wall outlet.
4. Remove the front Torx screw at the bottom of the gas
control valve/thermostat as illustrated in Figure 21.
5. Use a fl at-blade screwdriver to release the two tabs at
the top of the gas control valve/thermostat and lift the
electronic control straight up (see Figures 22 & 23).
6. Disconnect the temperature sensor cable.
Note: When removing the control module from the
gas control assembly, disengage the pins on the valve
module without causing damage.
7. Re-assemble in the reverse order.
Note: During re-assembly, align the pins on the valve
module to their proper location in the control module
without causing damage.
Figure 20
18
FRONT TORX
SCREW
Figure 21
LIFT THE
ELECTRONIC
CONTROL
STRAIGHT UP
THREADED CONTROL
FITTING
(DO NOT REMOVE
FROM WATER HEATER)
Figure 22
ELECTRONIC
CONTROL
MODULE
VALVE MODULE