Prolonged Shutdown. Frost Protection (Heating Circuit); Troubleshooting; Routine Maintenance Instructions - DeDietrich ZENA MS 24 MI FF Operating And Installation Instructions

9. PROLONGED SHUTDOWN. FROST PROTECTION
Do not drain the whole system as lling up with water again causes unnecessary and harmful scale to build up inside the
boiler and the heating elements. If the boiler is not used during winter and is therefore exposed to the danger of frost, add
some speci c anti-freeze to the water in the system (e.g.: propylene glycol coupled with corrosion and scale inhibitors).
The electronic boiler management system includes a "frost protection" function for the heating system which, when delivery
temperature falls below 5°C, operates the burner until a delivery temperature of 30°C is reached.
The frost protection function is enabled if:
* the boiler is electrically powered;
* the gas tap is open;
* the system is at the correct pressure;
* the boiler is not blocked.
Faults are shown on the display with an error code (e.g.: E 01):
Figure 3
CODE
FAULT
DISPLAYED
E01 Failed ignition shutdown
E02 Safety thermostat tripped
Flue thermostat/ ue pressure
E03
switch tripped
Shutdown after 6 consecutive
E04
ame losses
E05 Flow sensor failure
E06 DHW sensor fault
Hydraulic pressure switch
E10
block
Probable blocked pump safety
E25/E26
trip
E35 Parasite ame ( ame error)
Switching off due to reductions
E96
in power supply
N.B.:
in case of a fault, the display backlighting ashes together with the error code.

11. ROUTINE MAINTENANCE INSTRUCTIONS

To keep the boiler ef cient and safe, have it checked by the authorised Service Centre at the end of every operating period.
Careful servicing ensures economical operation of the system.
Do not clean the outer casing of the appliance with abrasive, aggressive and/or easily ammable cleaners (e.g.: petrol,
alcohol, and so on). Always switch off the appliance before cleaning it (see section 7 Switching off the boiler).
OPERATING INSTRUCTIONS

10. TROUBLESHOOTING

RESETTABLE
faults
CORRECTIVE ACTION
Press and hold down "R" for at least 2 seconds. If this fault persists, call the
Authorised Service Centre.
Press and hold down "R" for at least 2 seconds. If this fault persists, call the
Authorised Service Centre.
Call the Authorised Service Centre.
Press and hold down "R" for at least 2 seconds. If this fault persists, call the
Authorised Service Centre.
Call the Authorised Service Centre.
Call the Authorised Service Centre.
Check that the pressure in the system is correct; See section 6. If this fault
persists, call the Authorised Service Centre.
Call the Authorised Service Centre.
Press and hold down "R" for at least 2 seconds. If this fault persists, call the
Authorised Service Centre.
RESET is automatic. If this fault persists, call the Authorised Service Centre
To RESET the boiler, press and hold down "R" for at
least 2 seconds. If this fault persists, call the Authorised
Service Centre.
N.B.:
5 reset attempts can be performed after which
the boiler shuts down. To reset again, switch off the
boiler for a few seconds.
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71.06952.02 - EN