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Hello I've got a puma 100 with the top leaft hand connector burned out PL5 AND PL1 The pl5 orange and purple wires lead to a thermostat/ switch which is located on the top right hand side of the boiler Can anyone tell me what that stat/swicth is for? Has anyone seen this problem...

I have a potterton puma 100 combi. The hot water is fine, the problem is the radiators will not heat up. When the central heating switch is on the boiler fires up and then it shuts down shortly afterwards. The pressure needle is up near 3. I tried bleeding the radiators and recharging it...