Henny Penny SmartCombi ESC-220, Troubleshooting Manual

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Smart Combi™ Service
HW-Fail Temp UREF0 to high
Error description:
The error signalled, that the supply line is disturbed on the circuit board and/or from sensors. A sensor
has a very low resistor or direct chassis ground contact with the frame.
The first possibility is likely if the fault occurs during WaveClean or in steaming mode. Explanation:
The water gets into the probe and builds up an electric connection between the probe itself and the
chassis. Through this connection a voltage potential from the chassis reaches the temperature inputs of
the keyboard pcb and causes the malfunction.
Troubleshooting:
Disconnect the following components one by one to identify the faulty component:
–
Pressure switch B10 at the steaming unit
–
Core temperature probe B1
–
Drain probe B4
–
Chamber probe B2
–
Chamber probe B3 (only at floor unit 20.x)
If the fault appears only at the automatic cleaning WaveClean, the drain probe B4 is probably the
cause.
Error Power board
Description:
There is a communication error between keyboard and relay pcb.
Troubleshooting:
Waterfilter maintenance
The water quantity maintenance was activated in the user level (password 111). The adjusted water
quantity has flown by the soft water assembly.
Change water softener and enter the capacity in the corresponding level (password 111, water limit
maintenance).
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Check power supply of the relay
card (transformer T1 and relay
card plug X3).
Also see „Layout
of the relay card“
Change relay pcb.
Change keyboard pcb.. Mount the old
relay pcb again.
Check power supply of the relay
card (transformer T1 and relay
card plug X3).
Also see „Layout
of the relay card“
Change relay pcb.
Change keyboard pcb.. Mount the old
relay pcb again.