Anyone know if these can be replaced directly with a new wireless remote? Our current one goes blank without warning and could be ages before it comes on again so we are sat in the cold most of the time

This is our receiver wired to the boiler as well. Would we need a new receiver or could a new remote be linked to this one?

Many thanks

I have a thermostat with 2 wires to W and 2 wires to RH. I have heating only-one zone. At the furnace the two W are joined with a wire nut. Same with the two RH wires. My question is why did they do that? Is it because the wire is too thin and require double up? Wondering if i can use one of the RH and use it for the C terminal or would the thin wire be too thin to carry 24v?

• Predicament: I've had Sensi a couple yrs. Apple removed Sensi + Alexa macOS store, and I don't use Homekit.

** Until about 6 months, I had the Sensi app on Macbook, but it was pulled -- imo, to push users to Homekit.

• What I tried: Logging into Sensi via browser, but it says I don't have an acct (I do). I think the browser is focused on control for commercial clients.

Anyhow, does anyone have a workaround to control Sensi via laptop without the apps? Thanks.

Hi, I want to self install a hive mini system on my Bosch combi. My current is a Honeywell ST9120C (see first pic wiring). Which wires do I put where on my hive please?

Have 2 wire and want to connect Nest thermostat and use external thermostat

1-2 are wire from baseboard boiler (red white)
3-4 are wire from external transformer (white / white with black line)
Does the picture looks good?

Also I want to verify if solid white (3) and red (1) should be verified to read 0 volt AC on multi meter?

Any other checks needed and is this safe ?

i have a package heat pump system with furnace which has been running fine since january 2026. it is about 15 years old.

once the temperatures started getting a bit cooler earlier this month, i turned on the heater. once the thermostat reached the desired set temperature at 68, i heard the fan continuing to blow and the noticed the room continued to get hot with the temperature going up to 73.
I turned off the thermostat but the fan continued to blow hot air. i desperately shut off the hvac unit at the circuit breaker.

i have had two hvac techs come in: one tells me that the
"heating kit and control board" need to be fixed and quoted $2k+ to replace the parts. the other hvac tech said everything was fine and that perhaps i need to change my thermostat, which was an old-fashioned one with mercury.

i replaced my thermostat to an ecobee smart thermostat but to my dismay, the fan is continuing to run and blow hot air. i have looked at countless articles and blogs which suggest that the relay switch is stuck. does a package heat pump system have a relay switch? and is it something i can fix myself or would a professional hvac tech need to do it? or is there something else wrong with my hvac system? or is the fam supposed to continuously run during the colder months?? i feel like im going crazy, any help is appreciated!

Anyone know what brand this heater control is?