We had a Worcester Bosh Greenstar CDi installed five years ago - in the summer. As soon as the cooler weather started the boiler would trip the electrics several times a day when we switched on the hot water. The installer came back - couldn’t find anything wrong. Same story every year since - soon as it gets cooler this problem starts up - and then disappears usually mid to end of October. We’ve had two different engineers plus the original installer and none can work it out. Now it’s just started happening again this week! Has anyone heard of this before or can explain what could be going wrong? Thanks