Troubleshooting Guide - Brant Radiant Heaters DET3-20-65 User Manual

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?
Replace
gas valve.
Yes
Does the burner light?
Yes
Continued on page 58.
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 24VAC at the gas
valve during valve opening
(typically 10 seconds after
power to the heater). Is
No
there 24VAC to the valve?
Yes
Check that gas pressure is within
minumum and maximum inputs
Yes
as indicated on the heater's rating
plate. Is gas pressure ok?
Is the valve switch in
No the ON position?
Yes
Yes
Check the gap on the
No
igniter. Is the gap between
3/16 in. and 1/4 in.?
No
No
No
56
DET3 Series
Remove obstruction
and lubricate blower.
Yes
Is the blower
No
obstructed?
Adjust gap.
No
Yes
Replace 24VAC
Yes
transformer.
Is 120VAC being sent
to the transformer?
No
The circuit board and/
or wiring harness
could be faulty. These
should be replaced.
Correct problem.
Switch to the ON
position.