VNG/VLP SERIES PRESSURE WASHER
OPERATOR’S MANUAL
35
PROBLEM
POSSIBLE CAUSE
SOLUTION
FLOW & BURNER
SWITCH ON; NO
SPARK, NO PILOT GAS
A. No main power
With power switch on, open trigger on spray
gun and set your test meter to the 24 volt
scale. Probe terminals TH and GND. If you do
not read 24 volts, the problem is not the
ignition system. Perform normal system checks
of main power, transformer, thermostat and the
limit control. If you do read 24 volts at TH and
GND, 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 GND. If pilot gas does not
flow with 24 volts at these terminals, replace
gas valve.
3. Probe terminals PV and MV/PV. If 24 volts
not present, replace ignition control box.
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 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 burner ring
through a cut in the ignitor wire.
TROUBLESHOOTING — BURNER
