Buderus 800 - Page 47

Servicing 5
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
47
Code Meaning
E with
any
character
but P
UBA defective
Possible
cause
Action
1 Regulating device may have to cope with interference – Check if for example induction fields interfere with the
regulating device
– Check if the are any peaks in the electrical network
caused by maybe windmills or a power generator
2 UBA may be defective – Press reset. If fault code remains then try to temporarily
connect a different UBA (see subsection 5.3.5)
Code Meaning
EP Non compatible UBA fitted
Possible
cause
Action
1 Regulating device may have to cope with interference – Check if for example induction fields interfere with the
regulating device
– Check if the are any peaks in the electrical network
caused by maybe windmills or a power generator
2 Kim connected incorrectly or KIM defective – Check the KIM connector and fan connector (see
subsection 5.3.21).
If the connectors are fine then contact Buderus
Problem: No DHW , despite the system being operational
– Set chimney sweep switch to "0"
– Check three-way valve replace if necessary
– Check DHW sensor and replace if necessary
Problem: No heating, despite that there is a demand for heat and the boiler is operational
– Check regulating device configuration and/or the wiring
– Check the wiring between the regulating device and the UBA (see subsection 5.3.18)
– Check all the wiring
– Check the UBA and replace if necessary (see subsection 5.3.5)