Detroit Radiant Products Company DX3 Series - Manual (Page 14)

Is the blower
obstructed?
Replace circuit board.
14
Does the igniter warm
up and glow red?
Is the igniter
physically
damaged?
Check voltage at igniter during
ignition sequence (usually 30-
45 seconds after power to the
heater). Is it 120V?
Is the inlet or the outlet of
the unit obstructed (i.e.,
ice, birds nest, dirt, etc.)?
4.0 Troubleshooting Guide
4.0 Troubleshooting Guide
Turn up thermostat
Does the fan
blower turn on?
Is the power at the
heater 120V?
Find the source of the electrical
problem between panel and heater.
No
Yes
DX3 Series
Remove obstruction
and lubricate fan.
No
Yes
Does the switch
light energize?
Yes
Is the light burnt out?
If so, replace.
No No
Yes
Remove obstruction.
No
No No
No
Yes
Yes
Replace igniter.
Does valve light
energize?
Yes
Does the burner
ignite at all?
No
The circuit board and/or wiring
harness may be faulty and
needs to be replaced.
No
Yes
Replace faulty light.
Does valve open?
Yes
Yes
Continued on page 16.
No
Test for 120V at valve opening
period (usually 30 to 45 seconds
after power to heater). Is there
120V to valve for 8 seconds?
Replace circuit board and/or wiring harness.
Yes
No
No
Yes