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moogwai

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hey fellas, went to service a vaillant 837 this morning and found that there was a rattling coming from what sounds like the pump or divertor valve not sure which....just wanted to know if any of you guys had come across such a noise before? and could advise me on what the prob could be?? or would it be best just to take out pump and diverter and inspect?
and i couldn't do the service anyway as standing pressure at meter was only 18.5mb!!! transco to attend!!
 
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