Desa R35D Service Manual page 11

OBSERVED FAULT
1
2
TEST PROCEDURE
1 Check Ignitor
Disconnect ignitor wires from ignition control assembly.
Measure the resistance of the ignitor at the terminals with
an ohmmeter (use 0-200 OHM scale). Ignitor resistance
should measure 30 to 175 OHMS. If resistance measures
outside of this range, then ignitor is defective and should
be replaced.
2 Check Ignition Control Assembly
Remove fuse cover and check fuse (70,000 to 200,000
Btu models only). If fuse is blown replace it with a GMA-
10 fuse. Disconnect motor red and white wires from con-
trol. With Ignitor wires disconnected, attach voltmeter
leads to the ignitor terminals (labeled IGNITOR). Use the
0 to 200 V.A.C. scale. Plug power cord into a grounded
120V/60 Hz outlet. Meter should read 120V(rms) for ap-
proximately 10 seconds. If voltage reads 0 or stays at
120 for more than 10 seconds, the control is defective
and should be replaced.
WARNING: High Voltage!
For replacement parts contact:
Hot Surface Ignition Models Service Manual
Motor Starts and Runs but Fuel Does Not Ignite
Does Ignitor Element Heat Up?
No
WARNING: High Voltage!
Check for
Defective Ignitor
Defective Ignition
Control Assembly
Yes
3
Check for Proper Pump Pressure
Check for Restricted Fuel Flow
4 Due to:
A. Seal leak
B. Restriction in Nozzle or Nozzle Adapter
C. Defective Solenoid Valve
(200,000 Btu Models Only)
5 Fuel Filter Restriction
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11
Ignition Control