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I have recently had Honeywell Evohome controls installed. Since this was done I have had loud noises coming from the radiators and pipes at random times. I have just had one radiator changed and I now have a MUCH louder noise but at least I can now create the conditions to cause it to happen.
The heating system is a Worcester Bosch Greenstar 30 CDI System. The property is a bungalow with the boiler in the garage. There is a hot water storage cylinder in the garage which has a zone control valve connected to the Honeywell system.
There is no longer any zone control valve on the radiators relying on the Honeywell valves to control the water flow. There are 12 Honeywell valves. The pipes initially go down from the boiler and then up into the garage ceiling. There is an automatic bypass between the flow and return. The pipes run from the garage into the bungalow ceiling and then down through an airing cupboard into the solid floor and then are distributed to the radiators. There is a separate pair of pipes that feed the bathroom towel rails. These have never had a zone valve but the other radiators did originally have a zone valve controlled by the CH thermostat.
The system was drained down to fit new TRVs to 4 radiators when the Evohome was installed. The remaining TRV bodies were reused. Since then we have random loud vibrations from the pipework. this was mainly the return pipe that was vibrating.
In preparation for having the kitchen refitted I have just had the kitchen radiator (last Friday) replaced with a narrow/tall one and moved about 40 cm sideways. The original TRV body was re-used but moved to the return side rather than the flow side. The system was partially drained to change the radiator. Initially no water was flowing and the installer had to close all the other radiators off to force the water to flow to the new radiator.
I now have the new radiator working properly BUT when the Evohome starts to shut down the radiator (having reached the set temperature) there is a VERY loud noise coming from the radiator and pipework. the pipes in the airing cupboard are vibrating quite violently. The same thing happens when it is opening up again. The vibration can be started and stopped by slightly adjusting the TRV. I think this mainly happens when most of the other TRVs are closed and the kitchen one is only partly open. I assume that the boiler flow is running through the automatic bypass.
I have bled all the radiators and looked at the automatic air vents in the loft on the flow and return pipes. One released some air.
Can any of you make any suggestions. I have tried to get the heating engineers to come up with a fix but they have not responded to my request so far.
The heating system is a Worcester Bosch Greenstar 30 CDI System. The property is a bungalow with the boiler in the garage. There is a hot water storage cylinder in the garage which has a zone control valve connected to the Honeywell system.
There is no longer any zone control valve on the radiators relying on the Honeywell valves to control the water flow. There are 12 Honeywell valves. The pipes initially go down from the boiler and then up into the garage ceiling. There is an automatic bypass between the flow and return. The pipes run from the garage into the bungalow ceiling and then down through an airing cupboard into the solid floor and then are distributed to the radiators. There is a separate pair of pipes that feed the bathroom towel rails. These have never had a zone valve but the other radiators did originally have a zone valve controlled by the CH thermostat.
The system was drained down to fit new TRVs to 4 radiators when the Evohome was installed. The remaining TRV bodies were reused. Since then we have random loud vibrations from the pipework. this was mainly the return pipe that was vibrating.
In preparation for having the kitchen refitted I have just had the kitchen radiator (last Friday) replaced with a narrow/tall one and moved about 40 cm sideways. The original TRV body was re-used but moved to the return side rather than the flow side. The system was partially drained to change the radiator. Initially no water was flowing and the installer had to close all the other radiators off to force the water to flow to the new radiator.
I now have the new radiator working properly BUT when the Evohome starts to shut down the radiator (having reached the set temperature) there is a VERY loud noise coming from the radiator and pipework. the pipes in the airing cupboard are vibrating quite violently. The same thing happens when it is opening up again. The vibration can be started and stopped by slightly adjusting the TRV. I think this mainly happens when most of the other TRVs are closed and the kitchen one is only partly open. I assume that the boiler flow is running through the automatic bypass.
I have bled all the radiators and looked at the automatic air vents in the loft on the flow and return pipes. One released some air.
Can any of you make any suggestions. I have tried to get the heating engineers to come up with a fix but they have not responded to my request so far.
