Install a Honeywell T4 thermostat

Charn · 2026-07-17T18:54:18+0100

Hi, replacing my thermostat with a Honeywell T4 here here’s a photo of the back plate of the new thermostat and the wiring in the house if somebody could let me know which way it goes where that would be great

jj4091 · 2026-07-17T19:26:52+0100

What make and model is/was your old one

CountryFan · 2026-07-17T20:14:49+0100

Providing it’s just a switch, then one red to a and one to b.

Charn · 2026-07-17T20:46:24+0100

Yes the old one was
BOSS TPST501

Charn · 2026-07-17T20:46:55+0100

jj4091 said:
What make and model is/was your old one

The old one was a BOSS TPST501

Charn · 2026-07-17T20:47:24+0100

CountryFan said:
Providing it’s just a switch, then one red to a and one to b.

Thanks for that

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Install a Honeywell T4 thermostat

Charn

Attachments

jj4091

CountryFan

Charn

Charn

Charn

DIYnot Local

Similar threads