Mend > Home Heating Systems

How can i marry my honeywell CM921 the the BDR91 relay box?

we have a Honeywell CM921 thermostat and a BDR91 relay box, for the past two years was working fine. However recently the system appears to have stopped recognising eachother. To make the heating work we have to override the system we have to press the green button however the red button continues to flash. Any suggestions or tips would be most welcome.

David
January 2011

Honeywell Heating, Home Heating Systems Box Working Fine

does it have batteries?

brian
January 2011

Automatic Answer

While you wait for answers, we may have found some information which could help you.

Click here for Box Working Fine

Mend repair fix Honeywell home heating systems

Hot water but no central heating?

How do I reprogram my ideal bolier rf thermostat receiver?

heating, Oil boiler not running?

Replacing LP112 Programmer?

dmestic hot water near boiling point, howto adjust temperature?

isar he30?

why has my wireless time clock stopped responding?

Ideal Classic no heating but have hot water?

Converting to Y Plan system?

Mid position valve?

can i fix it honeywell st1000 ?

Honeywell ST7100 programmer goes blank when RUN selected?

Mend Honeywell Home Heating Systems

Related Categories

Mend > Home Heating Systems

How can i marry my honeywell CM921 the the BDR91 relay box?

Automatic Answer

How can i marry my honeywell CM921 the the BDR91 relay box?

I can answer this question ...

How can i marry my honeywell CM921 the the BDR91 relay box?

How to mend ...

Mend home heating systems ...

Worcester boiler dripping water?

Vaillant ecotec 831 plus?

Remove boiler cover?

Siemens RDJ10RF thermostat problem?

Boiler cycle?