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

Servicing
5.2

Fault codes

Code Meaning
2C
Safety sensor exceeds 100 °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 cabling
(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 cabling
(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
4 External domestic hot water tank is too small for the
heating capacity
Subject to modifications resulting from technical improvements!
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 05/2004
Action
Check if not all (thermostatic) radiator valves are clogged
with dirt.
Adjust the heating capacity (see subsection 2.1.10)
Measure if resistance over the sensor is correct.
If not replace safety sensor (see subsection 5.3.11,
subsection 5.3.12, subsection 5.3.13)
Check if the pump cabling is faulty or if the pump is stuck
(see subsection 5.3.9)
Top up the system (see subsection 2.1.1)
Action
Check if not all (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 5.3.11, subsection 5.3.12, subsection 5.3.13)
Check the sensor, replace if necessary (see subsection
5.3.14, subsection 5.3.15, subsection 5.3.16)
Check if the pump cabling is faulty or if the pump is stuck.
Replace pump if necessary (see subsection 5.3.9 and
subsection 5.3.10)
Top up the system (see subsection 2.1.1)
Action
Adjust the heating capacity (see subsection 2.1.10)
Check if not all (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 5.3.11, subsection 5.3.12, subsection 5.3.13)
Top up the system (see subsection 2.1.1)
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
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