Greenstar Wiring Centre not talking to boiler (or vice versa)

Greenstar Wiring Centre not talking to boiler (or vice versa)

Greenstar Wiring Centre not talking to boiler (or vice versa)

I have a Worcester Greenstar 27RI compact boiler downstairs which is connected to a Greenstar Wiring Centre upstairs next to the hot water cylinder. The wiring centre talks to the boiler on an eBus connection. About a month ago I connected a Tado stat to the wiring centre on IZ3 in the wiring centre as instructed by Worcester tech support. It's a simple relay setup, stat bridges IZ3 which calls boiler for heat. Everything has been working perfectly up to yesterday.

I noticed that the stat...

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by slpn1

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