11 Troubleshooting
11.1 Error codes
The boiler is fitted with an electronic regulation and control unit. The heart
of the control is a microprocessor, the Comfort Master
©
, which both pro
tects and controls the boiler. In the event of an error, a corresponding
code is displayed.
The meaning of the error codes can be found in the error table.
Note
Note the error code displayed. The error code is needed to find
the cause of the error quickly and correctly and for any support
from Remeha.
11.1.1 Blocking
A (temporary) blocking mode is a boiler status, resulting from an abnormal
state. The display shows a blocking code (for example
). The con
trol unit makes a number of attempts to start the boiler again. The blocking
codes can be read out as follows:
1. Press the two keys at the same time.
2. Confirm by pressing key
.
The display alternates between
and the blocking code
.
3. Press the key.
appears on the display.
Note
The boiler automatically returns to operation once the cause of the
blocking has been removed.
Tab.31 Blocking codes
Blocking code Description
Possible cause
Check/solution
Parameter error
Parameter error on the PSU
PCB
Reset
and
Restore parameters with Recom
Maximum flow temperature
exceeded
No flow or insufficient flow
Check the flow (direction, pump, valves)
Reasons for the heat demand
Maximum increase of the flow
temperature has been excee
ded
No flow or insufficient flow
Sensor error
Check the flow (direction, pump, valves)
Check the water pressure
Check that the sensors are operating cor
rectly
Check that the sensor has been fitted prop
erly
Check the cleanliness of the heat exchang
er
Maximum difference between
the flow and return tempera
ture exceeded
No flow or insufficient flow
Sensor error
Check the flow (direction, pump, valves)
Check the water pressure
Check that the sensors are operating cor
rectly
Check that the sensor has been fitted prop
erly
Check the cleanliness of the heat exchang
er
No release signal
External cause
Parameter error
Bad connection
Remove external cause
Check parameters
Check the wiring
Phase and neutral of mains
supply mixed up
Mains supply incorrectly
wired
Floating network or 2-phase
network
Invert phase and neutral
Set parameter
to
Fig.64 Blocking code
AD-0000089-01
11 Troubleshooting
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