Boulter Buderus Benchmark 600 Series, Installation And Servicing Instruction

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