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BredburyBlues
I've turned my central heating system on this week, yes i know its too early in the year and man points must be deducted. All the rads work fine and all is quiet….for a while, then a knocking starts to come from one of the rads. It generally happens once i've used the hot taps in either the kitchen or bathroom for the first time after the timers come on.
The noise appears to be located at the thermostats. If I adjust the thermostat slightly it can stop the noise but this will generally result in the noise moving to another rad meaning 1) I end up chasing the noise around the house and 2) the original rad might stop working until i put it back to the setting it was originally at. The noise does stop it I run the hot tap which makes me think theres air in the system but shouldn't it escape out of the taps if that was the case?
I turned off the system, all the rads and left them to cool down. I turned the system back on then the rads one by one starting with the nearest to the boiler. Everything was ok for about 30 mins until it started again.
This was a problem towards the end of the last central heating season so I've thought about replacing all the older thermostats as out of the 5 rads in the house the only one that didn't appear to be effected was the one that was installed a couple of years back (newer thermostat) but last night it turned out that one was playing up as well so i'm at a bit of a loss now.
Where should i go from here, all help is much appreciated.
N
The noise appears to be located at the thermostats. If I adjust the thermostat slightly it can stop the noise but this will generally result in the noise moving to another rad meaning 1) I end up chasing the noise around the house and 2) the original rad might stop working until i put it back to the setting it was originally at. The noise does stop it I run the hot tap which makes me think theres air in the system but shouldn't it escape out of the taps if that was the case?
I turned off the system, all the rads and left them to cool down. I turned the system back on then the rads one by one starting with the nearest to the boiler. Everything was ok for about 30 mins until it started again.
This was a problem towards the end of the last central heating season so I've thought about replacing all the older thermostats as out of the 5 rads in the house the only one that didn't appear to be effected was the one that was installed a couple of years back (newer thermostat) but last night it turned out that one was playing up as well so i'm at a bit of a loss now.
Where should i go from here, all help is much appreciated.
N
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