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refer in instructions that came with item Lost the instructions?
On the Danfoss thermostat, the battery compartment is just beneath the digital display and opens downwards. The battery compartment is on the left-hand side and opens like this: All you need to do is replace the two AA batteries. There is a thumbnail position at the bottom of the compartment.
Make sure that the temp probe from the thermostat is located exactly where the old one was. If it had a plastic sleeve on the old one, the new one will need that sleeve. You shouldn't need to calibrate the control if it is the one specified for this model. If it was a generic replacement then possibly it could need some adjustment.
While it appears the ST699 is a timer that connects to a thermostat.
So yes, they both control 230Volt boiler-and-pump. But there are differences. Google search each item and include .pdf in search parameter to find product manual for each, and then compare wiring differences.
Do you have a GE Thermostat or a Danfoss. It is important because the Danfoss uses a Temperature Control Relay if this is the case the relay contacts maybe stuck closed.
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