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

SV Series
14
Test for 24V at valve during
opening period (usually 7
seconds after power to heater).
Is there 24V to the valve?
Check voltage on the
secondary side of the
transformer. Is it 24V?
Is 24V going from the
exhauster power box
assembly to the burner
control box?
4.0 Troubleshooting Guide
Is the exhauster
obstructed?
Does the igniter warm
up and glow red?
Is the igniter
physically damaged?
Is the inlet or the outlet of
the unit obstructed (i.e.,
ice, birds nest, dirt, etc.)?
Turn up thermostat
Does the exhauster
fan turn on?
Is the power at the
exhauster 120V?
Find the source of the
electrical problem.
No
Yes
Remove obstruction
and lubricate fan.
No
Yes
Does the pressure
switch light energize?
Is the light burnt out?
If so, replace.
No No
Yes
Remove obstruction.
No
No No
Yes
Replace igniter.
Does the valve
light energize?
Yes
Does the burner
ignite at all?
No Yes Replace faulty light.
Does valve open?
Yes
Confirm that gas pressure
is within minimum and
maximum inputs as
indicated on the burner
rating plate. Is it ok?
No
Yes
Yes
Continued on page 16.
No
No
Yes
No
Repair faulty wiring
between the
exhauster power box
assembly and the
burner control box.
Replace
transformer.
Yes
Yes
Yes
Replace faulty circuit board
and/or wiring harness.
No
No
No Yes
4.0 Troubleshooting Guide