Fault Codes - Boulter Buderus Benchmark 600-28C Installation And Servicing Instruction

5 Servicing
5.2

Fault codes

Code Meaning
1C Blinking fault code: Flue gas temperature measured of more than 105 °C
Possible
cause
1 Flue gas temperature too high
2 Flue gas sensor faulty
Code Meaning
2E Non blinking fault code: Water pressure in the system lower than 0.2 bar.
Possible
cause
1 System pressure not checked in time
2 Pressure sensor is defect
Code Meaning
2F
Non blinking fault code: The flow part of the bi-sensor did not detect a rise in the temperature of the central heating
water after a burner start
Possible
cause
1 Resistance in the installation is too high
2 Water pressure is too low in the installation
3 Problem with the pump or pump cabling
(no circulation)
4 Bi-sensor is dirty or faulty
Code Meaning
2P
Non blinking fault code: Bi-sensor rises faster than 5 °K/sec.
Possible
cause
1 Resistance in the installation is too high
2 Water pressure is too low in the installation
3 Problem with the pump or pump cabling
(no circulation)
4 Bi-sensor is dirty or faulty
Subject to modifications resulting from technical improvements!
38 Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
Action
– Check the flue gas system
– Check the flue gas retarder
Check the wiring and connections of the flue gas sensor
and replace when necessary (see subsection 5.3.1)
Action
Top up the system to at least 1.0 bar
(see subsection 2.1.1)
Replace pressure sensor
Action
Check if not all (thermostatic) radiator valves are closed or
clogged with dirt
Top up the system (see subsection 2.1.1)
Check if the pump cabling is faulty or if the pump is stuck.
Replace pump when necessary (see subsection 5.3.6 and
subsection 5.3.7)
Check the bi-sensor for dirt. Measure if resistance over the
sensor is correct. If not replace bi-sensor (see subsection
5.3.8, subsection 5.3.9, subsection 5.3.10)
Action
Check if not all (thermostatic) radiator valves are closed or
clogged with dirt
Top up the system (see subsection 2.1.1)
Check if the pump cabling is faulty or if the pump is stuck.
Replace pump when necessary (see subsection 5.3.6 and
subsection 5.3.7)
Check the bi-sensor for dirt. Measure if resistance over the
sensor is correct. If not replace bi-sensor (see subsection
5.3.8, subsection 5.3.9, subsection 5.3.10)
Boulter Buderus Ltd. • http://www.boulter-boilers.com