Troubleshooting - Kärcher HDS 9/14-4 ST Betriebsanleitung

Danger
Risk of injury! The main switch of the vacuum cleaner is to be
switched off or the Cekon plug must be unplugged while carrying
out any repairs or maintenance jobs.
Fault
Machine is not running; indi-
cator lamp for operations
stand-by (F) is not glowing
+ Indicator lamp for engine
over-heating (G) is glowing
Burner does not ignite or the
flame glows off during opera-
tion
The indicator lamp Burner
failure (E) glows*
*
Note
Switch the plant off and then on to undo the burner failure.
**
32

Troubleshooting

Possible cause
There is no voltage in the machine. Check electrical mains.
Safety time switch is on.
Fuse in the control circuit (F3) has
burnt off. Fuse is located in the
control transformer (T2).
Pressure switch HP (High pres-
sure) or LP (Low pressure) is de-
fective.
Timer module (A1) defective.
Exhaust thermostat (B8) tripped.
Thermal sensor (WS) in the engine
or the over-current protection
switch (F1) has got activated.
The water shortage safeguard in
the swimmer tank has got activat-
ed.
Thermostat (B) has been set at a
very low temperature.
Machine switch is not positioned to
burner
The water shortage safeguard in
the safety block has got switched
off.
Fuel tank empty.
Fuel filter choked.
Photo-cell flame monitoring device
has been set wrongly or is defec-
tive.
No ignition spark exists (can be de-
tected through the sight glass in
the burner lid).
Ignition motor is locked.
Failure of hte fuel pump or the fuel
solenoid valve.
Remedy
Switch off the appliance switch briefly and
switch it on again.
Install a new fuse; if it burns out again, then
remove the cause for the over-loading.
Check pressure switch.
Check connections, replace if required.
Allow plant to cool down. Unlock the exhaust
thermostat (B8). Eliminate the cause for the
disturbance.
Rectify cause for over-loading.
Remove the water shortage.
Set the thermostat to a higher level.
Switch on the burner.
Ensure adequate water supply. Check ma-
chine for leaks.
Refill fuel.
Clean fuel filter - to do that remove the fuel fil-
ter by turning, clean it and again turn it in.
Check the correct positioning of the photo-
cell. **
Check electrodes distance between ignition
transformer and ignition cable. Rectify the
distance or replace defective parts. Clean it,
if necessary.
Removing the blockage. Remove the stop-
per (I) on the operating plan and unlock the
over-current protection switch. Insert back
the stopper.
Check parts and replace defective parts.
11
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