Troubleshooting
Heating remains
co
ld
Display:
»»HEAT
IN
G ERR'"'·
• The unit does not start.
- Electronics defective
- Boiler water thermostat set too low
Clearance:
• Turn the switch for boiler circuit emergency
operation on the control panel to "Manual
".
The heating system runs without the electronic
program
in
emergency operation.
Set the boiler water temperature with the boiler
water thermost
at.
Domestic wat
er
remains cold
Display:
»»
WWATER
ERR""·
The control can be defective when the domestic
water
rem
ains co
ld
.
Clearance:
• Turn the switch for domestic water heating
emergency operation on the control panel to
"Manual".
The heating system runs without the electronic
program
in
emergency operation. The boiler
water temperature determines the domestic
water temperature.
• Set the boil
er
water thermostat to 60 °C.
Warning!
The domestic water can reach
the
same tempe-
rat
ur
e as
the
boiler water. Risk
of
scalding by
hi
gh
boiler water temperatures.
Note:
Domestic water cannot be heated, not even
in
emergency operation, when the storage tank
loading pump is defective.
28
HERTIJ'JG
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