Why is my boiler doing this?

[saabuldin]

I have 8 rads in my terraced house, all rads except bath room have trv 's. What i did was switch all off except 1 bedroom and bathroom. The thermostat is in that same bedroom. What the boiler is doing is firing for about 25 seconds and then turning off for a bit then firing, in a cycle.

The 2 rads are heating up like they should. But why is the boiler going on and off continuously?

And am I saving money as boiler goes on and off?

Thanks in advance.

I'm an electrician by the way.

 

[Killy Bing]

Your boiler if its a modern one that is will modulate down to say 8kw.
you re most likely only needing 2kw, so the boiler fires up, return gets hot quick, boiler shuts off on its stat and repeat.

 

[wattsie1987]

It sounds like the output from the rads is lower than the minimum output from the boiler which is right unless the two rads are huge. Basically the boiler is producing too much heat for the rads to use so is cutting out as it is up to its max temperature. As the temp drops it will kick back in then cut out and so on. Not an ideal for the boiler will be better to have an all round low heat in the other rooms to avoid the boiler cycling on and off. Its actually cheaper to heat every room if only a little.

 

[saabuldin]

My boiler is heatline c24. Not the best but working fine.

 

[Billy Bob Bob]

I have 8 rads in my terraced house, all rads except bath room have trv 's. What i did was switch all off except 1 bedroom and bathroom. The thermostat is in that same bedroom. What the boiler is doing is firing for about 25 seconds and then turning off for a bit then firing, in a cycle.

The 2 rads are heating up like they should. But why is the boiler going on and off continuously?

And am I saving money as boiler goes on and off?

Thanks in advance.

I'm an electrician by the way.

all sparkies will be shot on site

 

[lame plumber]

My boiler is heatline c24. Not the best but working fine.

ideal boiler for a sparky as it means he'll be paying a plumber regularly

 

[Bunker]

all sparkies will be shot on site

On site or on sight? Either is appropriate

 

[saabuldin]

On site or on sight? Either is appropriate

Come on guys. Give me a chance.

 

[Billy Bob Bob]

On site or on sight? Either is appropriate

in the sights

 

[SafeGasInstall]

No chances given , you had yours and you decided to be a
electrician .... Now open all the valves on all rads and enjoy your weekend

 

[lame plumber]

Come on guys. Give me a chance.

do you need a quote for a boiler then?

 

[SafeGasInstall]

We have a good network of plumbers all over the UK

 

[village idiot]

We have a good network of plumbers all over the UK

they will fit you a replacement boiler at a reasonable price.
my only concern is, they may not be willing to let you 'wire' the boiler and it's controls? especially if it's a system boiler.

 

[mountainman]

Come on guys. Give me a chance.

Posts 2 & 3 are probably spot on.
Nothing more needed imo :-X

 

[saabuldin]

they will fit you a replacement boiler at a reasonable price.
my only concern is, they may not be willing to let you 'wire' the boiler and it's controls? especially if it's a system boiler.

Thanks for offer but il run this one till it dies.

Another question. If my room doesn't reach stat temperature after 3hours. The Rad is big enough for the room by working out btu output and room size, what do you u think the problem is. I set to 19 and it went to 18 from 15 in 3 hours

 

[AWheating]

balancing, undersized rad, roomstat in the wrong place..............probably fitted by a sparks


are the rads valves fully open?

 

[village idiot]

If your boiler is cycling, then the rads wont have time to heat up as boiler keeps turning on and off to prevent it from overheating. Turn other rads on. BTW, if your boiler thermostat is set to low, then that is the temperature that your room will be as, regardless of the thermostat setting

 

[Killy Bing]

Thanks for offer but il run this one till it dies.

Another question. If my room doesn't reach stat temperature after 3hours. The Rad is big enough for the room by working out btu output and room size, what do you u think the problem is. I set to 19 and it went to 18 from 15 in 3 hours

*facepalm*

youre not just heating the room, youre heating the fabric of the building aswell.

so with only two rads on out of 8.............

 

[saabuldin]

If your boiler is cycling, then the rads wont have time to heat up as boiler keeps turning on and off to prevent it from overheating. Turn other rads on. BTW, if your boiler thermostat is set to low, then that is the temperature that your room will be as, regardless of the thermostat setting

But Rad is hot like normal and I got wireless stat. Rad been hot for 3 hours.

 

[saabuldin]

*facepalm*

youre not just heating the room, youre heating the fabric of the building aswell.

so with only two rads on out of 8.............

Oh right I get it now. So it will take longer to heat fabric building then heat room

 

[saabuldin]

Another question. Have any of you guys fitted wireless trv ' s. The ones controlled from pc or phone so you have separate zones. Like Upstairs and Downstairs separate. Are they any good and what brand would you recommend?

 

[wattsie1987]

Is the boiler flow temp set high enough? most probably undersized rad. Heat loss is worked out with internal doors closed, I bet yours isn't and the heat is going to the rest of the un heated house.

 

[Killy Bing]

Google love honey trv and have a look at them.

 

[wattsie1987]

Honeywell all the way not seen them controlled by anything other than a controller panel tho. There designed as an option to provide time and temp control which is pretty pointless if you have a non condenser or don't use all the rads on the system. Waste of money for very little gain TBH expensive!

 

[saabuldin]

Google love honey trv and have a look at them.

You joker