Wolf CSO24 Service Manual page 39

CSO24 and CSO30 (SWS #13508346)
Error Diagnostic Of Error
Message
Code (Through Microcontroller)
E71 F22 Water system
If descaling was carried
out recently:
Water is not continuing to
be fed in during steaming
E72 --- Water system
If it has been a while
since last descaling:
Level detector pin with
high resistance again
after pumping off water 5
times
E73 F23 Water system
If descaling was carried
out recently:
Level detector pin with
high resistance again
after pumping off water 5
times
E74 --- Water system
Descaling error during
descaling phase
(appliance is blocked)
E75 --- Water system
Descaling error during 1
st rinsing phase
(appliance is blocked)
E76 --- Water system
Descaling error during
2nd rinsing phase
(appliance is blocked)
E81 --- Relay calibration
E85 F4 Slide motor
Motor current shows
short circuit
E86 F4 Slide motor
Motor current shows
break
E87 F4 Exhaust air slide valve
Path of slide valve
restricted (motor current
error during slide valve
test)
Possible Cause
(Ranked by Frequency)
1. Boiler scaled up.
2. Inlet valve leaking (valve not tight, limescale fragments in seal,
etc.)
1. Drain pump pumping off too little water.
2. Water conductivity too low.
3. Foam in boiler housing (unsuitable descaling agent).
1. Drain pump pumping off too little water.
2. Water conductivity too low.
3. Foam in boiler housing (unsuitable descaling agent).
1. No descaler added.
2. Error in measurement of level (possibly due to formation of
foam).
1. No or insufficient amount of water for rinsing.
2. Excessive build-up of foam.
1. No or insufficient amount of water for rinsing.
2. Excessive build-up of foam.
1. No calibration of relay. Replace processor.
1. Short circuit in slide motor or in its wiring.
1. Break or loose contact in slide motor or in its wiring.
1. Exhaust slide valve stuck with grease deposits.
2. Motor or slide valve jammed (mechanical defect).
3. Short circuit in slide motor or in its wiring.
5-7
Troubleshooting Guides
#9001333 - Revision A - August, 2014