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If you're wondering, the wiring centre is an almost entirely 230V (AC) device - there's no low voltage anywhere. The two relays turn on the boiler and manifold pump, or operate the valve. The relays are activated whenever any of the zones turns on. Electrically each zone has a diode and a resistor all sort of connected together to energise the coils. If you do decide to do any fixing, make sure it's all turned off first, and be careful!