Radiators not getting hot

locky76

I've an outdoor oil boiler doing the central heating in my house with a gravity fed system, it's about 6 years old and i got it serviced this summer.
This winter the rads in my bedroom and ensuite and not heating up very well, i changed the circulating pump about a month ago and it worked ok for a while but has stopped working now again.
Any ideas on where i could be going wrong?
I have a few ideas below.

• System needs to be balanced?
• Thermostat too high on boiler leading to vanes in circulating pump melting?

Any help or other ideas would be greatly appreciated;)

Outkast_IRE

locky76 wrote: »

I've an outdoor oil boiler doing the central heating in my house with a gravity fed system, it's about 6 years old and i got it serviced this summer.
This winter the rads in my bedroom and ensuite and not heating up very well, i changed the circulating pump about a month ago and it worked ok for a while but has stopped working now again.
Any ideas on where i could be going wrong?
I have a few ideas below.

• System needs to be balanced?
• Thermostat too high on boiler leading to vanes in circulating pump melting?

Any help or other ideas would be greatly appreciated;)

Balancing would be the first thing to check usually.
Why would you suspect thermostat too high, did you change it what is it set to now?

locky76

Outkast_IRE wrote: »

Balancing would be the first thing to check usually.
Why would you suspect thermostat too high, did you change it what is it set to now?

It's the thermostat outside in the boiler, a firebird boiler btw.
I cranked it up to the max along with the pump speed when i changed the circulating pump.

Billy Bunting

locky76 wrote: »

This winter the rads in my bedroom and ensuite and not heating up very well, i changed the circulating pump about a month ago and it worked ok for a while but has stopped working now again.

Your not very clear here, have you bleed the rads ?? is there water ?? clean water ?? have you moved the lockshield/balancing valves on the other rads ?

locky76

Billy Bunting wrote: »

Your not very clear here, have you bleed the rads ?? is there water ?? clean water ?? have you moved the lockshield/balancing valves on the other rads ?

I've bled all rads, not very much air in the system at all, water is clean, haven't gone near the lockshield/balancing valves on the other radssince the system went in and it worked ok until now.

Billy Bunting

What pump have you put in ?

locky76

Billy Bunting wrote: »

What pump have you put in ?

A grunfaus i think was the make of it.

sponge_bob

is the pump turned in the right direction?
i remember a few years back i fitted a new pump buy faced it the wrong way, took a few days for the penny to drop.:)

d o'c

are the pump isolation valves ( slotted screw head?) fully open?