Detroit Radiant Products Company DES3 Series - Manual (Page 14)

14
DES3 Series
Is the ball valve in the
ON position?
Check that gas pressure is within
minimum and maximum inputs as
indicated on the heater’s rating plate.
Is gas pressure ok?
Does the fan
blower turn on?
4.0 Troubleshooting Guide
4.0 Troubleshooting Guide
Is the blower
obstructed?
Turn up thermostat.
Is the power at the
heater 120VAC?
No
Remove obstruction
and lubricate blower.
Does the igniter
spark?
Is the igniter
physically
damaged?
No
Yes
Replace igniter.
Yes
No
Find the source of the
electrical problem .
Check the gap on the igniter.
Is the gap between
3/16 in. and 1/4 in.?
No
Adjust gap.
Yes
No
Yes
No
During the ignition
trial, does the gas
valve open?
Yes
Test for 120VAC at the gas
valve during valve opening
(typically 10 seconds after
power to the heater). Is there
120VAC to the valve?
No
Yes
The circuit board and/or
wiring harness could be
faulty. These should be
replaced.
No
Does the burner light?
No
Yes
Correct
problem.
Replace
gas valve.
Yes
No
Yes
Continued on page 16.
Yes
No
Turn knob on ball valve to
the ON position.
Yes