Buderus 800-24 Installation And Servicing Instructions page 45

Code Meaning
E with
UBA defective
any
character
but P
Possible
cause
1 Regulating device may have to cope with interference
2 UBA may be defective
Code Meaning
EP
Non compatible UBA fitted
Possible
cause
1 Regulating device may have to cope with interference
2 Kim connected incorrectly or KIM defective
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)
Subject to modifications resulting from technical improvements !
Installation and servicing instructions condensing gas boiler 800 - 24/29/43/60 and 800 - 24T25/29T25 H/V • edition 02/2006
Action
– 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
– Press reset. If fault code remains then try to temporarily
connect a different UBA (see subsection 5.3.5)
Action
– 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
– Check the KIM connector and fan connector (see
subsection 5.3.21).
If the connectors are fine then contact Buderus
Servicing 5
Buderus • http://buderus-domestic.co.uk
45