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Hi, I've purchased a Siemens RDJ10 RF programmable thermostat to fit with my Potterton Puma 100e. Can anyone please advise on wiring instructions? Thanks!

I have a Potterton Puma 100e. Works fine in every respect, except that the water temperature doesn't stay constant when taking a shower - it goes from hot, to cold and back again constantly - hot-cold-hot-cold....etc. The cycle of hot to cold probably takes a minute or so. I inherited this...