central heating

Hi, I have an issue with my boiler which consists of it making a hissing noise and pressure meter going up when the central heating is on. I haven't tested what happens when the pressure is extremely high as I turn it off before it goes above 3 bars. The central heating is not working but hot...

Hi all, I am in need of a little help... Boiler: Worcester Bosch RD532i Current Thermostat: TR2 Room Thermostat New Thermostat: BHT-6000 I want to fit the new thermostat to the boiler, but the wiring is very confusing and even though I have extensive knowledge of renovation, some wiring and...

I'm planning on updating our central heating system in the next few weeks and need some advice in regards to rewiring for the new central heating controller. We currently have an ancient Potterton EP2000 unit controlling the central heating and I'm looking to replace it with a Honeywell T6R-HW...

I'm getting the home heating system replaced. current setup is: https://www.diynot.com/diy/threads/too-many-boilers-for-the-22mm-pipe.511647/#post-4248767 post 9 It looks like we're going for: -a single gas boiler -unvented 3 zoned central heating -large area roof solar PV with excess...

Hi all, Just wondering if anyone knows if there is a way to call for central heating/turn central heating on without a thermostat? Reason is, I've had an electrician install a Nest for me but I'm pretty sure they've not done it correctly, as now the CH is not working - However I don't want to...

My old cast iron gas boiler with pump overrun needs a bypass, hitherto provided by one radiator with 15mm inlet and outlet pipes and 2 lockshield valves. My intention is to install smart TRVs on every radiator, which means I will need to install a bypass pipe immediately after the pump, between...

Solved. Hello. First time poster, happy to be torn to shreds if appropriate! I have recently moved house and found that the room thermostat was wildly inaccurate. It was a Horstmann HRT-2. I replaced this with a Drayton RTS-8. When I switched the heating power back on, the 3A central heating...

I'm only speculating as to what is actually happening here, it turns on and stays on for a few minutes, then it does this - clicks a bit, fan slows down, fan speeds up, clicks a bit, fan slows down, fan speeds up - does this a few times then cuts out. I was wondering if anyone else has ever...

I have a RT500RF thermostat and RT500RF(RX) receiver. All is working correctly but i think I'm getting interference from a neighbour. My receiver differs from the one in all the documentation (maybe its old?) and looks like this...

I have a danfoss hsa3 with 3 way valve. In the last month it has stopped functioning correctly. Now when CH is called only the motor winds, clicks the midway micro switch briefly then clicks back slightly past the switch turning it off again. If HW and CH are called then it’s both work. HW...

Hello! We moved to a new house in the summer and have only needed to use the central heating the the past couple of weeks, but it seems to go on and off at strange times of the day and night. As far as we can see all we have is a WR1 unit next to the boiler and a T4RF unit in the hallway which...

Good Morning All, I have a Baxi Combi 105HE. The boiler doesn't appear to be firing when the demand for Central Heating is set to occur. If I run a hot tap, the Central Heating LED goes out, the Hot Water LED illuminates and the boiler fires. When I close the tap, the Hot Water LED goes...

Good Afternoon I would be very grateful for some assistance with my Central Heating controls, as I seem to be having some issues with these. The house I moved in to a few months ago has two DANFOSS devices installed - - An RET2000 Thermostat (In the living room) - An RX1s receiver - in the...

I have a Gloworm Flexicom 18hx boiler, Drayton T721R Programmer, a Drayton MAI/679-3 3 PORT VALVE and a Drayton RTS2 thermostat and a Drayton cylinder stat. The programmer, 3port valve and both thermostats are all new. The hot water system is behaving correctly, switching off with the...

I am currently looking at installing a HIVE Active heating control unit to replace a Danfoss TP5. I currently have a 3 core and earth cable running to the existing heating controls (battery powered unit) I have attached my existing wiring diagram and the HIVE wiring diagram. Please also see...

Hi all, I just bought a house and noticed the central heating wiring was a bit of a mess. I bought a Nest 3rd gen and thought it would be worth trying to sort it whilst fitting it into my new house - everything was wired straight into the old Honeywell ST7100 without any sort of junction box...

Hi all, After a bit if advice if poss. I have an old open vent system in my house, and from a fair old bit of investigation I definitely think the pump is in the wrong place. It's straight after the boiler on the flow side, before the open vent. From my workings it looks like it should be...

Hi. I have a Danfoss CP715Si which has been working fine for years but recently I came back from holiday and the hot water wasn’t working. I reset the controller by poking the reset button and it worked, but it flashed up 706 n02 before the clock came back on. The next day again the hot water...

We had an extension done about 11 years ago and have just found out that the boiler was wrongly installed on the boundary wall. the vent slightly overhangs into neighbour s property which is about 1metre away from their wall and the steam blows around near their door. The neighbours after all...

Had a quick search on the forum and couldn't find anything specific to my question so here goes.. We've been renting a 3 bed detached bungalow for about a year now and regardless of what we've tried (balancing rads, turning thermostat down, turning CH boiler temp up or down, turning DHW boiler...