Bought a thermostat for a combi boiler and can't work out how to wire it in. The thermostat is 230v, the instrusctions say 230v input and output, and has terminal connectors for N L SL. The boiler has 2 connections for a thermostat that currently just has a bit of cable connected between them meaning the heating is permanently on unless switched off manually. the voltage between the 2 connectors in the boiler however is only 12v. does this mean that the thermostat is incompatible with the boiler? If not how should it be wired?
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