Buderus RC20 - Troubleshooting; Fault and Special Message Codes

Troubleshooting 6
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Operating instructions RC20 room controller • Issue 08/2006
A01/
816
1)
Communication to the Energy
Management System (EMS) is
faulty, e.g. through a loose contact or
through electro-magnetic
interference.
Check whether the programming
unit sits correctly in its wall
mounting base.
Check whether two leads are
connected to the programming unit
wall mounting base.
A11/
802
1)
The date or time is not set. This may
have been caused by an extended
power failure, for example.
Enter the date and time on the
RC30/RC35 to enable all heating
programs and additional functions
to work correctly.
A11/
803
1)
A18/
802
1)
The date or time is not set. This may
have been caused by an extended
power failure, for example.
Enter the date and time on the
RC20 to enable all heating
programs and additional functions
to work correctly.
Hxx
2)
Example: Maintenance is required.
The heating system remains active
as long as possible.
Notify your heating contractor who
should carry out the maintenance.
H 7
2)
The water pressure in the heating
system has dropped to a low value.
This is the only maintenance
message which you can action
yourself. The heating system must
be equipped with a digital pressure
sensor. Regularly check the heating
system water pressure at the
pressure gauge, if this is not
installed.
Top up the heating water as
described in the boiler operating
instructions.
Code Display Cause Remedy
Tab. 3 Faults and special messages
A01
A11
A18
H2
H7
1)
The fault code has two digits. The first indicates the service code (e. g. "A01").
Turn the rotary selector clockwise to display the second part (e.g. "816").
2)
Not possible for operation using boilers with UBA 1.x.
USER NOTE
Further fault displays are feasible. For related explanations, see
the documentation supplied or ask your local heating contractor.
Faults can be displayed as plain text on a programming unit, if
your heating system has been equipped with such a unit
(e.g. RC30/RC35).