Repair manual

29
The electronic control unit can store up to 5 faults, which can
be read out and displayed with the timer.
The current error is shown as “AF” and is always written to
memory location F1.
Previous faults are transferred to memory locations F2 - F5; if
necessary, the content of memory location F5 is overwritten.
Retrieve fault memories F1 to F5
• Press key
c
---> HYDRONIC is switched on.
• Press key
a
and keep held down, then within 2 sec. press
key
p
.
Display readout:
AF = current fault
3-digit number = fault code
• Press the
f
> key once to display F1, twice for F2 etc.
The fault code, description of the fault and comments / reme-
dial measures are described on pages 30 to page 33.
Cancel control unit locking and simultaneously clear fault
memory
Condition:
An electrical connection exists between Terminal 15 (ignition)
and the timer, 12-pin connector, compartment 10.
• Press key
c
Display readout:
The current fault F15, F16 or F50
• Press key
a
and keep held down, then within 2 sec. press
key
p.
The modular timer has now entered the “Interrogate fault
memory” routine.
• Switch ignition off (terminal 15).
• Press key
a
and key
p
simultaneously; in addition, switch
the ignition on (terminal 15) and wait until the following
appears in the display:
Display readout following ignition “ON”:
Display flashes,
Heater symbol does not flash
• Switch HYDRONIC off and on --> the control unit is
unlocked, the HYDRONIC starts up again.
Information shown after switching off and on, and new
interrogation of fault memory:
Display flashes
Heater symbol does not flash
4 / Troubleshooting
Fault diagnosis with the modular timer
Modular timer
Cat. No. 22 1000 30 34 00
~ Clock time
Ä Area code
Å Heat
Ç Back
É Forwards
Ñ == Display with error message