VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
37
TROUBLESHOOTING
BURNER
PROBLEM
POSSIBLE CAUSE
SOLUTION
FLOW & BURNER
SWITCH ON. NO SPARK,
NO PILOT GAS
A. No main power
With power switch on, open trigger gun and set
your test meter to the 24 volt scale. Probe
terminals TH and TR. If you do not read 24 volts,
the problem is not the ignition systsem. Perform
normal system checks of main power,
transformer, thermostat, and the limit control. If
you do read 24 volts at TH and TR, the problem
is in the ignition system. Check for loose or
defective wiring. If wiring is good, replace the
ignition control unit.
B. Faulty transformer
C. Faulty burner & flow switch
D. Faulty ignition control unit
HAVE SPARK, NO PILOT
GAS FLOW
Main gas supply turned off
Set test meter to 24 volt scale.
1. Be sure main gas valve (gas cock or selector
arm) is turned on.
2. With gas on and system sparking, probe
terminals PV and TR. If pilot gas does not flow
with 24 volts at these terminals, replace gas
valve.
3. If you do not read 24 volts at terminals PV and
MV/PV, replace the ignition control unit.
HAVE PILOT GAS,
NO SPARK
A. Defective ignitor/sensor
and/or its wiring
Set test meter to ohm scale.
1. Disconnect the wire from the IGN terminal on
the ignition control unit.
B. Faulty ignition control unit
2. Touch one meter probe to the tip of the
ignitor/sensor rod in the pilot. Touch the other
probe to the quick-connect at the other end of
ignitor/sensor wire.
3. If you have continuity from the tip of the ignitor/
sensor rod to the connector and no spark,
replace the ignition control unit.
4. If you do not have continuity through the wire
and the ignitor/sensor, check for a loose wire
connection in the wire. Repair as needed.
5. Check to see if spark shorts to furnace
through a cut in the ignitor wire.