What does -//- mean flashing on my Worcester Bosch 37cdi, no heating!?

Is the electrical supply to your boiler OK? If it's being interrupted, that caould cause the cycling you are seeting. get someone who knows enough about electrics to do it safely, to have a look.

trevor
November 2012

Did a search for "Worcester Bosch 37cdi fault indication"

Found an instruciton manual and a servicing guide. See

http://www.acwilgar.co.uk/user-manual-for-greenstar-cdi.pdf

and

http://www.theplumbstore.com/downloads/dl/file/id/1331/installation_and_servicing_instructions_for_greenstar_cdi_part_1_of_2.pdf

plus

http://www.theplumbstore.com/downloads/dl/file/id/1332/installation_and_servicing_instructions_for_greenstar_cdi_part_2_of_2.pdf

Read the first PDF (http://www.acwilgar.co.uk/user-manual-for-greenstar-cdi.pdf) and you will see, on page 13:

• The boiler runs for 15 minutes at minimum heating output to fill the condensate trap, the display alternates between “-II-” and the central heating flow temperature. This occurs every time the mains supply has been interrupted.

Switch on, leave for at least 15 minutes and see if the teperature comes up to normal after the safety cycle has completed.

Anon
November 2012