Service Handbook OEB/OES/OGB/OGS
6.9 Pressure Switch Cleaning System - Trouble Shooting
i
Information:
In the detergent line a pressure switch detects a shortage of detergent (error “ low
agent pressure”). If this pressure switch is not working properly, the detergent
pump will continue working and will empty the tank premature.
Units involved:
OSP/OES/OEB/OGS/OGB with CO
NVOClean
system.
What is the reason?
Due to vibration or wear of the membrane the
switching point of the pressure switch can drift away.
How to detect this error?
If the tank (especially the Convocare/rinsing fluid tank) is being emptied premature
and the pumps are working properly, a new adjustment (or replacement) of the
pressure switch must be completed.
Instruction – Optical inspection
1. Optical inspection on leakage (please inspect all the hoses, connectors and
pressure switch)
2. Optical inspection on bending or blockage (please inspect if a hose is bended
extraordinary or the strainer in the detergent tank is blocked)
3. Optical inspection of the sprayer inside the cavity and behind the suction
panel on leakage.
4. Check and adjustment of the pressure switch (see below)
Instruction - How to check (and if necessary adjust) the pressure switch
1. Disconnect one pump electrically and prepare a electric wire to activate the
rinsing pump (230V or 110V)
2. Select service mode (press 3 sec on temperature/ time / core temperature
simultaneously)
3. Remove the hose out of the rinsing fluid tank and keep the pump running.
4. Observe if no fluid is entering the cavity anymore and select service mode r18
5. Keep the pump running and read r18: value must be “0” (=no pressure), if
value is “1” replace pressure switch.
6. Put the hose in the rinsing tank (or water tank) again (pump still running!)
7. After a few seconds, reading must switch to “1” (=pressure available); if
reading turns to “1” (stabile reading for at least 10 sec.) continue with step 14.
8. If reading continues to be “0” adjust pressure switch as follows:
AS/11-2011 6_09e_Pressure Switch Cleaning System - Trouble Shooting_b
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