Boulter Buderus Benchmark 600 Series, Installation And Servicing Instruction

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Servicing 5
44 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
Code Meaning
9A; 9H
;
9U ; P
Blinking fault code : System error
Possible
cause Action
1 UBA not placed correctly Check to see if UBA is securely mounted
(see subsection 5.3.2)
2 UBA may be defective Press reset. If fault code remains then try to temporarily
connect a different UBA (see subsection 5.3.2)
3 KIM may be defective action Call the service department of Boulter Buderus
Code Meaning
9L Blinking fault code : Gas valve assembly error
Possible
cause Action
1 Wiring to the gas valve incorrect, or loose wiring
connections in UBA – Check the electrical connections of the gas valve.
– Measure the resistance of the gas valve
– Check if for example induction fields interfere with the
regulating device
2 UBA may be defective Press reset. If fault code remains then try to temporarily
connect a different UBA (see subsection 5.3.2)
3 KIM may be defective Call the service department of Boulter Buderus
Code Meaning
CA Blinking fault code : Return sensor exceeds 105 °C
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 Return sensor is dirty or faulty Check the return sensor for dirt.
Measure if resistance over the sensor is correct.
If not replace return sensor (see subsection 5.3.8)
Code Meaning
CO Blinking fault code : Pressure sensor fault
Possible
cause Action
1 Wiring and connections of the pressure sensor may be
faulty Check the wiring and connection of the pressure sensor
2 Pressure sensor may be faulty Check the pressure sensor and replace when necessary