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Fault 02
Internal fault
Some parameters reset to factory settings
due to EEPROM problem
Fault 02
Internal fault
FR120 can no longer control the CH system
Fault 03
Room temp sensor faulty
Fault 10
System configuration: invalid
Fault 11
System configuration: new BUS device
New ISM detected. Power up all ISMs
simultaneously and start automatic system
configuration.
Fault 11
System configuration: new BUS device
New IPM detected. Check and modify
system configuration.
Fault 12
System configuration: BUS device missing
ISM1/ISM2not detected. Check connection.
Fault 12
System configuration: BUS device missing
IPM for cylinder downstream of low loss
header not detected. Check connection and
identification.
Fault 12
System configuration: BUS device missing
IPM with identification x not detected.
Check connection and identification.
Fault 13
System configuration: BUS device changed
or replaced
Check system configuration for DHW or start
automatic system configuration.
Items 1, 3 and 4 in Fig. 16)
Code Cause
205 Some parameters reset to
255 FR 120 can no longer control
20
21
190 Incorrect type of connection 1-
131
132
135
137
170
171
172
173
178
179
157 BUS subscriber changed or
default.
the heating system.
The room temperature sensor
built into FR 120 / FR 10 has
suffered a break.
There is a short circuit on the
room temperature sensor built
into the FR 120 / FR 10.
2-4 set.
New ISM detected.
New IPM detected.
ISM1/ISM2 no longer detected
in spite of having been
configured.
IPM for cylinder downstream of
low loss header not detected.
IPM with code x not detected
replaced.
Troubleshooting | 53
Remedy (by contractor)
Check parameter settings and
readjust as necessary. Identify
faulty controller and replace.
Identify faulty controller and
replace.
Identify faulty controller and
replace.
Check system configuration
and set BUS as connection
type.
Power up all ISM
simultaneously and start
automatic system
configuration.
Check and adjust system
configuration.
Check connection.
Check and correct code. With
the IPM isolated from the
power supply.
Check and correct code. With
the IPM isolated from the
power supply.
Check system configuration for
DHW heating or start automatic
system configuration.
6 720 800 817 (2012/02)
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Table of Contents
Troubleshooting
