Service Manual

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Step 1. Un-latch and remove top surround cover
from top of water heater.
Step 2. Locate the damper at the back of the units. If the
damper is working pr
operly intake air should be
pulling in through the screened elbow (see picture
right).
Step 3. Verify that the damper is in the “Open” positio
n when
there is a call for heat (see picture below). If you hear
the blower on but damper is not open turn the power
switch off for 30 seconds and re
check to see if
damper opens. If the damper doesn’t open replace it.
Step 4. Check for voltage at the damper harness connection.
Use a volt meter set to read l
ine voltage (see picture
below). There should always be 102 to 132 volts
between black and white wires. There should also be
102 to 132 volts
between blue and white wires when
there is a call for heat.
Step 5.If 120 volts is not present from either two inspection
points check the
harnesses for damage and replace if
needed.
Step 6. Restore water heater to use 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 10. Repl
ace surround cover on top of water heater.
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
120 Volt Intake
Damper
Air Flow
Damper in
open
position
Screened elbow
removed to see
damper position
Voltmeter set to
voltage
Check for voltage at
damper harness from
control board.
Remove screw for
elbow removal
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