Honeywell Room Stat 4200 3879-001 - Replacement ??

[utterlydiy]

I have a Honeywell Room Stat with a number on its cover 4200 3879-001.

Its has Brown base and Beige cover, with four terminals and only 3 of the 4 used.

Any clues of a replacement for this today.

thanks

 

[denso13]

Need some more info on the type of system you have //www.diynot.com/forums/plumbing/what-thermostat-can-i-get-to-replace-this-ancient-one.363503/

 

[utterlydiy]

Ok,

The timer/programmer maybe alittle ancient too.

7 day programmer - 'Drayton Tempus Severn'.

Boiler - 'Worcester - Greensaver force vented' - fitted Nov 2012

Two motorised valves - Open/Closed

Airing cupboard Hot water tank has a Stat too.

Is that of any use.

Could suggest a replacement Programmer too.

Thanks

 

[Dan Robinson]

DT90. From Honeywell.

Wires on 1 and 3 ho to terminals A and B. . Other wire made safe.


Job done in 5 minutes.

 

[utterlydiy]

Sorry forgot to mention,

All upstairs radiators have thermostats, set on the low side basically warming the rooms on a cold morning.

Thanks

 

[utterlydiy]

Sorry again,

Another thing I forgot to mention,

There is also a Multi Function/Speed pump in the airing cupboard, fitted same time as new boiler by Brit Gas.

Would having a pump make and difference to the wiring of the DT90E as advised above by Dan..

thanks

 

[utterlydiy]

DT90. From Honeywell.

Wires on 1 and 3 ho to terminals A and B. . Other wire made safe.


Job done in 5 minutes.

Thanks, Works a treat.