Troubleshooting Guide - Brant Radiant Heaters DX3L Series Manual

5.0

Troubleshooting Guide

5.0 Troubleshooting Guide
Turn on control
device for heat.
Does the draft
No
inducer motor
turn on?
Yes
Does the
pressure switch
No
indicator light
turn on?
Yes
Remove obstruction or
correct vent lengths.
Does the igniter
No
warm up and
glow red?
Yes
Replace igniter.
Does the valve
No
indicator light
turn on?
Yes
Does the gas
No
valve turn on?
Yes
Continued on page 58
Pressure switch
is stuck. Replace
faulty switch.
Yes
Is the pressure
No
switch light on?
Is the inlet or outlet of the
heater obstructed, or is
the vent exceeding the
recommended lengths?
Yes
No
Is the igniter
physically
damaged?
Yes
Yes
Disconnect igniter
and measure the
resistance. Is it
No
between 50-400 Ω?
Does the gas valve turn on?
Do you see the burner in
the sight glass?
No
Check inlet pressure to
the heater. Is it within the
minimum and maximum
allowable range as per the
rating plate?
Start
Question
Does the heater have 120 VAC
at the main power connection?
No
Find source of electrical problem.
Check for loose wiring or
restrictions in the hose
No
connection to the pressure
switch. Are they acceptable?
Replace wiring or hose
connections.
Check voltage at igniter
sequence (usually 5 to
15 seconds after call
for heat). Is it 120 V?
Remove
obstruction.
Yes
Gas valve indicator
Yes
light is burned out.
Replace light.
Are the wires to and from the
Yes
gas valve properly connected?
No
Adjust inlet pressure.
56
DX3L Series
Key
Process Corrective
Question
Action
Yes
Yes
No
Is the inlet or
the outlet of the
No
unit plugged or
obstructed?
Yes
Replace circuit board.
Correct wiring.
No
No
Yes