Central heating takes ages and very slow

[Selvaraj]

I have got a problem with central gas heating that radios taking minimum of 8 hours to heat and very slow by the time next day comes and we switch off heating.
I have tried bleeding radiator and switch on only one radiator at a time and see that removes sludge in system if any
I have checks pump and I can feel vibration .
The hot water is all ways on
I can fee a pump running noise 24/7

 

[Stu-B]

It could be a number of reasons, pump running slow, blockages in the system, air lock in the pipework, boiler not functioning correctly,
Have you lived in the property long? Has the heating always taken this long or is it a recent thing?

 

[Selvaraj]

It could be a number of reasons, pump running slow, blockages in the system, air lock in the pipework, boiler not functioning correctly,
Have you lived in the property long? Has the heating always taken this long or is it a recent thing?

Many thanks for the reply.
We have recently moved to this property.
We moved hot water conventional cylinder to garage due to space problem upstairs.
The hot water is working fine.
But hearing not working.
But the hearing pump always running
I can hear that sound while sleeping on the bed room.
I have checked with previous tenenat and they said that the hearing was instant and working
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Many thanks for the reply.
We have recently moved to this property.
We moved hot water conventional cylinder to garage due to space problem upstairs.
The hot water is working fine.
But hearing not working.
But the hearing pump always running
I can hear that sound while sleeping on the bed room.
I have checked with previous tenenat and they said that the hearing was instant and working

When I switch on nest thermostat for heating the boiler doesn’t start immediately.
Should the boiler always start when I turn the thermostat is on.

 

[SimonG]

Just because the pump is humming or vibrating doesn't mean it is pumping. Impeller could be damaged or detached.

You are really going to have to give out a lot more information for any body to help on here.

Did the shutting everything off bar 1 radiator make that hot?
Is it an open vented system?
Boiler type/make?
Boiler location, pump location, method of control s plan, y plan, pumped heating, gravity hot water?
Radiators hot at top cool at bottom or just cool all over?
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Forget that, you have air in the system or the cylinder works have caused another issue, get them back.

 

[centralheatking]

I would suspect the pump which feels like its running but might well have a detached impellor your rads are warming up slowly by convection. centralheatking

 

[Selvaraj]

Thank you guys so much for helping with this problem

Did the shutting everything off bar 1 radiator make that hot?
It is hard to say shutting which radiator makes other one hot
It is not consistent and I am tired of doing that experiment
Is it an open vented system
Yes
Boiler type/make?
Main heat
Boiler location, pump location, method of control s plan, y plan, pumped heating, gravity hot water?
Boiler in ground floor and pump in garage it is grandfos
Radiators hot at top cool at bottom or just cool all over?
No same everywhere

 

[centralheatking]

Thank you guys so much for helping with this problem

Did the shutting everything off bar 1 radiator make that hot?
It is hard to say shutting which radiator makes other one hot
It is not consistent and I am tired of doing that experiment
Is it an open vented system
Yes
Boiler type/make?
Main heat
Boiler location, pump location, method of control s plan, y plan, pumped heating, gravity hot water?
Boiler in ground floor and pump in garage it is grandfos
Radiators hot at top cool at bottom or just cool all over?
No same everywhere

If your radiators are hot at the top and cool at the bottom, you really have
ferric sludge problems. You really need to get going on this winter is on its
way... tell us about your diy competance ....then we will suggest a suitable
pathway for you to follow.....centralheatking

 

[Selvaraj]

If your radiators are hot at the top and cool at the bottom, you really have
ferric sludge problems. You really need to get going on this winter is on its
way... tell us about your diy competance ..then we will suggest a suitable
pathway for you to follow...centralheatking

My DIV competence that I can change the tap and Cartridge etc, pit waste pipe for dishwasher etc
One mor thing the pump is always running whether thermostat is on or off
[automerge]1571661008[/automerge]
Is the pump mine is Grundfos used for both hot water and heating ?

 

[Stigster]

If your radiators are hot at the top and cool at the bottom, you really have
ferric sludge problems.

He said they were the "same everywhere" so not hotter at top or bottom.

 

[Selvaraj]

Could it be a problem with Honeywell motorised stuck value which is not opening value for hot water becacuse boiler heating hot water not central heating
If so how to remove or open stuck valve

 

[centralheatking]

He said they were the "same everywhere" so not hotter at top or bottom.

stated hot at top in op chking, it appears its a rental correct me ...if thats the case
advice changes ....centralheatking

 

[Selvaraj]

Radiators are cold at top and bototm

 

[Stigster]

Radiators hot at top cool at bottom or just cool all over?
No same everywhere

Just going by this answer here. One thing to consider though, there may be confusion here on whether OP means top and bottom floors or top and bottom of each individual rad.

I'm now not certain which of the two options he means!

 

[Selvaraj]

Just going by this answer here. One thing to consider though, there may be confusion here on whether OP means top and bottom floors or top and bottom of each individual rad.

I'm now not certain which of the two options he means!

Both ground floor and first floor, the radiators are cold on bottom and top

 

[fronty]

Could it be a problem with Honeywell motorised stuck value which is not opening value for hot water becacuse boiler heating hot water not central heating
If so how to remove or open stuck valve

It could be, there's normally a lever you can move and lock into the central heating position, this allows you to manually open the valve against the spring, try that and let us know if it helps.