RKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62574-1 – 10.2010
Installation manual
48
U0 Refrigerant failure (due to
refrigerant leak)
Contact your local dealer.
U2 Main circuit voltage failure Contact your local dealer.
U3 Underfloor heating screed
dry-out program has been
stopped by another error, or by
pushing operation off button, or
by power failure.
The error can only be reset in
the test mode as follows:
First, press the z button 4 times
so the t icon will be
displayed. Then press the y
button 1 time. Finally push the
z button to exit the test mode.
Notes:
• In this case [F-09] "Latest
action number executed" will
contain the latest action
number executed.
• [F-08] "Underfloor heating
screed dry-out program
enabled (1)/disabled (0)" is
always cleared to 0 (disable).
This means that in case a
second time a "Underfloor
heating screed dry-out
program" must be started,
[F-08] needs to be set again.
U4 Communication failure Contact your local dealer.
U5 Communication failure Contact your local dealer.
U7 Communication failure Contact your local dealer.
UA Communication failure Contact your local dealer.
Error
code
Failure cause Corrective action
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