Troubleshooting - Kärcher HDS 9/16-4 ST Gas Mode D'emploi

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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
Indicator lamp for exhaust
gas thermostat (K) is glowing
*
Note: Press unlocking key for exhaust gas thermostat (J) to unlock the flame monitoring mechanism.

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 con-
trol transformer (T2).
Pressure switch HP (High pres-
sure) or LP (Low pressure) is defec-
tive.
Timer module (A1) defective.
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.
Close the gas valve.
The maximum temperature limiter
in the water outlet (> 110 °C) has
got triggered.
No gas supply.
The incoming supply or exhaust air
outlet has got blocked.
Boiler floor is too hot. The maxi-
mum temperature limiter in the boil-
er floor (> 80 °C) has got triggered.
No condensate water in the boiler.
Automatic gas firing system is
showing interruption.
No ignition. *
Blower or speed control plate is de-
fective. *
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.
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.
Open gas valve.
Let the boiler cool down and restart the appli-
ance.
Check thermostat.
Open the gas supply.
Check ventilation and exhaust system.
Add 5 litre water via the measuring nozzle for
exhaust gas.
Press the unlocking key for the gas relay (I). Operator
Check electrodes distance between gas firing
system and ignition cable. Rectify the dis-
tance or replace defective parts. Clean it, if
necessary.
Check blower and speed control plate. Re-
place plug and cables. Replace defective
parts.
11
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