10
Maintenance
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW
OPERATING
PRESSURE
Faulty pressure gauge
Install new gauge.
Insufficient water supply
Use larger supply hose; clean filter at water inlet.
Old, worn or incorrect spray nozzle
Match nozzle number to machine and/or replace with
new nozzle.
Belt slippage
Tighten or replace; use correct belt.
Plumbing or hose leak
Check plumbing system for leaks. Re-tape leaks with
teflon tape.
Faulty or mis-adjusted unloader valve
Adjust unloader for proper pressure. Install repair kit
when needed.
Worn packing in pump
Install new packing kit.
Fouled or dirty inlet or discharge valves
in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves
Replace with valve kit.
Obstruction in spray nozzle
Remove obstruction.
Leaking pressure control valve
Rebuild or replace as needed.
Slow engine RPM
Set engine speed at proper specifications.
Pump sucking air
Check water supply and possibility of air seepage.
Valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary.
BURNER
WILL NOT
LIGHT
(continued on
next page)
Little or no fuel
Fill tank with fuel.
Improper fuel or water in fuel
Drain fuel tank and fill with proper fuel.
Clogged fuel line
Clean or replace.
Plugged fuel filter
Replace as needed.
Mis-adjusted burner air bands
Readjust air bands for clean burn.
Little or no fuel pressure from fuel
pump
Increase fuel pressure to specification and/or replace
fuel pump. Test with pressure gauge.
Faulty burner transformer
Test transformer for proper arc between contacts.
Replace as needed.
Disconnected or short in electrical
wiring
All wire contacts should be clean and tight. No breaks in
wire
Flex coupling slipping on fuel pump
shaft or burner motor shaft
Replace if needed.
On-Off switch defective
Check for electrical current reaching
burner assembly with burner switch on.
Heavy sooting on coil and burner can
cause interruption of air flow and
shorting of electrodes
Clean as required.
Improper electrode setting
Check and reset according to diagram in Operator’s
Manual.
Fuel not reaching combustion
chamber
Check fuel pump for proper flow. Check solenoid flow
switch on machines with spray gun control, for proper
on-off fuel flow control.
Landa PDHW Service Manual 8.920-098.0 - AU
Summary of Contents for PDHW5-35624E
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Page 14: ...14 Notes Landa PDHW Service Manual 8 920 098 0 AU ...
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Page 36: ...36 Wayne Burner EHASR AC Landa PDHW Service Manual 8 920 098 0 AU ...
Page 43: ...43 Landa PDHW Service Manual 8 920 098 0 AU Notes ...
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