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nice one! thanks again.

Hi Muggles,thanks again for your help....i got all that so far..its the grey wire from the boiler flex that is confusing me (that currently goes to pin 4 of the hortsmann).

Sorry...put wrong name of timer/programmer. its a horstmann 425 coronet not a horstmann 425 Diadem as originally stated. Main post has been amended. Anyone got any advice on the wiring ?

cheers for that...it gets serviced every Jan, so ill be sure to mention it to them when they come out. Any advice on the wiring of the hive especially the wires in pins 1 and 4 from the boiler...?

would i be better off getting an engineer to take a look before trying to fit it myself ? I thought it would be pretty straight forward after reading all the threads on here. Its the extra wire from the boiler thats throwing me.

Hi Muggles, thanks for the reply.Its a vaillant ecotec plus boiler,had it installed about 8yrs ago to replace a back boiler and hot water tank system.There is no control or timer for the water, just the heating. heres a pic of the boiler if it helps..

hi guys..just picked up a hive active heating thermostat (for combi boilers). I currently have a horstmann 425 coronet with a downstairs wall mounted thermostat and a vaillant ecotec plus combi boiler. As it is a combi boiler ,i thought to wire the hive thermostat it would just be L N E and CH...