Technical data

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