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What`s wrong potterton puma 80?

System lock-outs, Low system pressure System over pressures,
sometimes no water flow through heating system but through PRV. DHW ok, unless low pressure lock out.
Dials will not control temps for either DHW or CH. Sometimes too hot.
Stephen C, January 2005
Fixed it (I hope)
Replaced switching valve (really crudded up) and Pressure release valve (same as above)

Stephen C, January 2005
This sounds very much like my problem. What is causing it? How do I fix it?
Thanks,
Sean

Sean, January 2005
PHONE ME I WILL TALK YOU THROUGH THE PROBLEM 07710230494

SHAHZAD, January 2005
link Click here to see other fixes for Potterton.