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5. Limit Control Module
a) Shut-off electrical power to the heater.
b) Remove control cover screws and open con-
trol compartment.
c) Disconnect wiring connections to the board.
d) Carefully pull out the control board from the
nylon pin supports.
e) Reverse above procedure to reinstall.
6. Sensor Probe Replacement
a) Shut off electrical power to the heater.
b) Shut off water supply to the heater and open
drain valve to remove water to the sensor
probe level.
c) Remove front panel and control box cover.
d) Disconnect wire leads from temperature con-
trol module.
e) Remove sensor probe from the header. Use
7/16" wrench.
f) Reverse above procedure to reinstall.
7. Manual Reset High Limit Control Replacement
a) Shut off electrical power and water supply to
the heater.
b) Remove front panel and open drain valve to
remove water to the limit control level in the
tank.
c) Disconnect wiring connections to limit control.
d) Remove limit control from the tank. Use 1" hex
wrench, being careful not to break plastic body.
e) Reverse above procedure to reinstall.
8. Auto Reset High Limit Replacement
a) Shut off electrical power and water supply to
the heater.
b) Remove front panel and open drain valve to
remove water to the limit control level in the
header.
c) Disconnect wiring connections to limit control.
d) Remove limit control.
e) Reverse above steps to reinstall.
9. Air/Vent Switch Replacement
a) Shut off electrical power to the heater.
b) Remove front panel.
c) Remove wiring connections to switch.
d) Remove screws (2) holding the switch.
e) Reverse above procedure to reinstall.
10. Remote Sensor Replacement
a) Shut off electrical power & gas supply to the
heater.
b) Remove front panel.
c) Disconneect wiring lead from sensor.
d) Remove the screws (2).
e) Reverse above procedure to reinstall.
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11. Combustion Air Blower Replacement
a) Shut off electrical power to heater.
b) Remove front panel and access cover on left
side of heater.
c) Remove screws (3) on blower housing mount-
ing panel.
d) Drop down blower assembly from discharge
connection.
e) Open field wiring box and disconnect blower
wiring.
f) Reverse above steps to reinstall blower.
12. Pump/Circulator Replacement
a) Shut off electrical power to the heater.
b) Shut off water supply and open drain valve to
remove water in the piping at the pump level.
c) Remove front panel and access panel on right
side of cabinet.
d) Disconnect wiring and conduit connections to
motor.
e) Remove plumbing connections to pump as-
sembly.
f) Reverse above procedure to reinstall.
13. Temperature and Pressure Relief Valve
Replacement.
a) Shut off electrical power to the heater.
b) Shut off water supply and open drain valve to
remove water in the tank to the relief valve
level.
c) Remove front panel.
d) Disconnect plumbing connections to the T & P
relief valve.
f) Reverse above procedure to reinstall.