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- 10 Dec 2008
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I have an ancient Vaillant 242 which has worked faultlessly for nearly 15 years. I’ve had it serviced annually, and it’s just gone on and on. However, the guy who’s kept it up for me has recently shut up shop, just at the time when it’s developed a fault. Noone locally wants to touch it, saying it's not worth the time and effort.
Changing it is not an option - I just can't afford it at the moment.
The DHW is intermittent, sometimes it comes on fine, other times not at all. I have a service manual, and have confirmed that the servo value is throwing over correctly, and that the plunger on the Diverter Valve moves left closing both micro switches. However, sometimes the CH flow pipe gets hot, indicating the valve is letting-by.
What I don’t understand is how can this be an intermittent fault? Before I strip and overhaul the DV, could someone confirm that this is likely the cause?
For info, the DHW H/E is the later plate type, although I’m not sure if the DV diaphragm was changed at the same time.
Thanks in advance for your help with this
Chris
Changing it is not an option - I just can't afford it at the moment.
The DHW is intermittent, sometimes it comes on fine, other times not at all. I have a service manual, and have confirmed that the servo value is throwing over correctly, and that the plunger on the Diverter Valve moves left closing both micro switches. However, sometimes the CH flow pipe gets hot, indicating the valve is letting-by.
What I don’t understand is how can this be an intermittent fault? Before I strip and overhaul the DV, could someone confirm that this is likely the cause?
For info, the DHW H/E is the later plate type, although I’m not sure if the DV diaphragm was changed at the same time.
Thanks in advance for your help with this
Chris