Chapter 4 Fault diagnosis
SMSO-2-02.04- 15.07.03 115
No hot water serving
(For other possible faults, please see “instant heater does not heat up”)
System / component Possible cause Remedy
Operation hot water served too fast (instant heater
power sufficient to heat approximately 4
dl of water per minute)
no measures to take
Water supply no pressure/too little pressure in pipe
system
Check water connection (supply valve at
mains connection on the premises)
Check pump pressure (see “Mainte-
nance, set pump pressure”)
Non-return valve clogged or defective replace
Instant heater Supply pipe clogged or calcified clean / replace
Outlet valve calcified or defective, or faulty cabling
Baffle clogged / calcified
clean/ replace (see “control system
diagram, outlet valve tea”)
clean /replace the baffle (see spare
parts catalogue)
Electrical faults
Power PCB / power relay
Power PCB, power relay faulty check and replace the power PCB or
power relay (see control system dia-
gram, heating for instant heater tea”)
Unit control system defective replace (see “Maintenance, unit control
system”)
Load machine data (counter and set-
tings) to new unit control system
Operator PCB Faulty button Dismantle the operator PCB, loosen the
PCB from the ‘top to button’, dry the
keyboard; refit the operator PCB and in-
sert into the panel.
Programming
Instant heater
Hot water serving not programmed Correct the programming (see pro-
gramming instructions)
Machine or customer number pro-
grammed incorrectly
Correct the programming (see pro-
gramming instructions)
Heating time too long
System / component Possible cause Remedy
Instant heater Supply pipe clogged or calcified clean / replace
Heating defective or heavily calcified replace (see “Maintenance, instant
heater tea”)
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