Adding a DT90 Honeywell Room Thermostat

[Volvican]

After many months of our current thermostat just shutting off intermittently for no apparent reason, I finally got around to calling up Honeywell and telling them I needed to replace the thermostat and could they help. They said sure - here are some Honeywell installer sin your area. When the last one wanted to charge me £250 to install the new thermostat, I started doing some digging and discovered this should be an easy-peasy job. I seem to be wrong.

I ordered one replacement from Amazon - it came and I could not get the thing to go into Continuous mode. I follow the directions - even followed a Youtube video but when I get to install mode and try to hit the down arrow to go to 'continuous' nothing happens. I thought it was a problem with the thermo so I returned it.

Ordered another - and wouldn't you know - it's doing the same thing. So what am I doing wrong? When I get to install 'INST' it shows the open spanner - but I didn't think that was a problem. Is it? How can I get this thing to go to continuous so I can pair it with the receiver?

Any help would be gratefully appreciated.

 

[Dan Robinson]

£250 might not be so much after all.


How hard can it be?

 

[Dan Robinson]

Besides.... You seem to have made a rather biiiig mistake before you even opened the box.

 

[Dan Robinson]

We would be about £225 to supply and fit.


And we're classed as specialists. Not just your run of the mill installers

 

[Volvican]

Besides.... You seem to have made a rather biiiig mistake before you even opened the box.

What's that? Or shall I regret asking this question?

 

[Dan Robinson]

Well let's just say it was a mistake a Honeywell registered installer wouldn't have made.

 

[Dan Robinson]

Namely knowing the difference between a 0 series controller and a 2 series controller.

 

[Dan Robinson]

A please and a thank you might not go amiss either.

 

[Volvican]

Please, any help would be appreciated.