Fault Codes - Buderus 600 - 11R Installation And Servicing Instructions

5.2

Fault codes

Code Meaning
2C
Safety sensor exceeds 95 °C
Possible
cause
1 Resistance in the installation is too high
2 Heating capacity is too large for the installation
3 Safety sensor is faulty
4 Problem with the pump or pump cable (flex)
(no circulation)
5 Water pressure is too low in the installation
Code Meaning
2F
Temperature difference between the safety sensor and flow sensor is greater than or equal to 15 °K
Possible
cause
1 Resistance in the installation is too high
2 Safety sensor is dirty or faulty
3 Flow sensor is dirty or faulty
4 Problem with the pump or pump cable (flex)
(no circulation)
5 Water pressure is too low in the installation
Code Meaning
2P
Safety sensor rises faster than 5 °C/sec.
Possible
cause
1 Heating capacity is too large for the installation
2 Resistance in the installation is too high
3 Safety sensor is dirty or faulty
Subject to modifications resulting from technical improvements!
Installation and servicing instructions for wall-mounted condensing gas boiler Buderus 600 - 11R/19R/24R • 02/2006
Action
Check if not all (thermostatic) radiator valves are clogged
with dirt.
Adjust the heating capacity (see subsection 2.2.7)
Measure if resistance over the sensor is correct.
If not replace safety sensor (see subsection 5.3.8,
subsection 5.3.9, subsection 5.3.10)
Check if the pump cable (flex) is faulty or if the pump is
stuck
Top up the system
Action
Check if (thermostatic) radiator valves are closed or
clogged with dirt
Check the safety sensor for dirt. Measure if resistance over
the sensor is correct. If not replace safety sensor (see
subsection 5.3.8, subsection 5.3.9, subsection 5.3.10)
Check the sensor, replace if necessary (see subsection
5.3.11, subsection 5.3.12, subsection 5.3.13)
Check if the pump cable (flex) is faulty or if the pump is
stuck. Replace pump if necessary.
Top up the system
Action
Adjust the heating capacity (see subsection 2.2.7)
Check if (thermostatic) radiator valves are closed or
clogged with dirt
Check the safety sensor for dirt. Measure if resistance over
the sensor is correct. If not replace safety sensor (see
subsection 5.3.8, subsection 5.3.9, subsection 5.3.10)
Buderus • http://www.buderus-domestic.co.uk
Servicing 5
47