Detroit Radiant Products Company QTS Series - Manual (Page 36)

QTS Series
36
5.0 Maintenance
5.0 Maintenance • Troubleshooting Guide
Continued on page 38
Do both burners light?
Troubleshooting Guide
Turn up thermostat/controller.
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
Find the source of the
electrical problem
between panel and
external transformer.
Is there 120V on the
primary side of the
controller/external
transformer?
Check the power across the
green and white wires of the
yellow control cord.
Is there 24V power?
Controller/external
transformer is faulty and
must be replaced.
The thermostat/controller or wiring is
faulty and should be replaced or repaired.
Find source of electrical
problem between
the external transformer
and thermostat/controller.
Is there 24V on the
secondary side of the
external transformer?
Is there 24V to the
thermostat/controller?
Yes
Yes
No No
No
Yes
Is the inlet or the outlet
of the unit plugged or
obstructed?
Remove obstruction.
Yes
No
Does the unit spark?
Is there 24V at the blue and yellow
secondary side of the internal transformer
and common on the pressure switch?
No
No
Yes
Yes
No
Is there 24V at the
N.O. terminal of the
pressure switch?
Check wire connection to primary
of the transformer. If good,
replace faulty transformer.
Yes
Yes
No
No
No Is the ball valve/shut-off
in the ON position?
Are the igniter(s)
physically damaged?
Yes
Yes
Replace damaged
igniter(s).
No
Turn On.
Does the amber light
illuminate?
Yes No
No
Yes
Yes Yes