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Hi, New to the forum but a real problem with my controls. This is a new installation, I have a vaillant ecotec plus 624 system boiler with a vrc 430, vr61, vr81 for HT zone 2. The system is designed as in diagram 4 in the vr61 instructions. 3 x 2 port honeywell valves. I have a vr10 sensor...