Troubleshooting - Landa PDHW5-35624E Service Manual

Maintenance

Troubleshooting

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