Central Heating Issues

[HOUSER1980]

Hi All after some advice. Moved into a new house last week. It has a ground floor, first floor and second floor. Turned the heating on for the first time last night. The radiators in one living room, the bathroom and the 2 on the second floor work fine and get nice and warm although the 2 on the second floor needed bleeding quite a bit. Tried bleeding all the others and they are still cold. Even checked the pipes going into those radiators and they were cold.
Don't think the system has been used for a while. Any ideas why the majority of radiators are cold? Will there just be a load of air in the system or is there a bigger issue?
When they heating has been in for a while there is a strange humming noise around the whole house which may or may not have something to do with it.
Thanks in advance.

 

[CBW]

Hello,

• Check for an additional thermostat, it may be separated into zones.
• When you bled the radiator(s) was air present?
• What boiler/system do you have?

 

[Mottie]

When they heating has been in for a while there is a strange humming noise around the whole house which may or may not have something to do with it.

Pump worn out?

 

[HOUSER1980]

Thanks CBW. I will have a look for a zone valve.
Certainly in the 2nd floor rads there was a lot of air.
The boiler is a combo boiler Garda Plus HE.

Not sure about the pump mottie.

 

[terryplumb]

How many radiators don't heat up ?
Do they have thermostatic radiator valves ? Are both their valves open ?

 

[HOUSER1980]

The kitchen, front living room and 3 bedroom radiators on the 1st floor don't work but the bathroom one does.

When u say both valves do u mean on each side of every radiator? I've checked a couple and I do think the pin is a bit low. Should the pipe going into the thermostat valve be warm?

Thanks

 

[terryplumb]

The TRV's pin should move up and down ( once actuator head is removed) if you press it. If stuck down its closed and rad won't heat up. The other end of rad is a lockshield and usually not interfered with by householder ,but should also be partly open to some degree.
The pipes will not necessarily be warm if there is no flow through the rad.