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5.0
Troubleshooting Guide
5.0
Troubleshooting Guide
Turn up thermostat.
Does the fan
blower turn on?
Yes
Does the igniter
spark?
Yes
During the ignition
trial, does the gas
valve open?
Yes
Replace
gas valve.
Does the burner light?
Yes
Continued on page 50.
Find the source of the
electrical problem
No
Is the power at the
No
heater 120VAC?
Replace igniter.
Yes
Is the igniter
No
physically
damaged?
Test for 120VAC at the gas
valve during valve opening
(typically 10 seconds after
No
power to the heater). Is there
120VAC to the valve?
Yes
Check that gas pressure is within
minimum and maximum inputs as
Yes
indicated on the heater's rating plate.
Is gas pressure ok?
Is the ball valve in the
ON position?
No
Yes
.
Yes
Check the gap on the igniter.
No
No
No
48
DES3
Series
Remove obstruction
and lubricate blower.
Yes
Is the blower
obstructed?
Adjust gap.
No
Yes
Is the gap between
3/16 in. and 1/4 in.?
The circuit board and/or
wiring harness could be
faulty. These should be
replaced.
No
Correct
problem.
Turn knob on ball valve to
the ON position.
No
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