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First check that the thermostat has fresh batteries and that they are correctly inserted. The problem could be your thermostat itself and also it could be affected by several reasons. Where Do I Connect My C Wire From My Thermostat When There Are Two Transformers Home Improvement Stack Exchange Check its switched on with a full charge or working batteries Ensure that the temperate is turned up to the level you require Check your Wi-Fi connection if applicable with the boiler thermostat. Boiler thermostat not working . So before you are going to ask help from HVAC repair professionals and give them money do a quick research and try to estimate the problem by yourself. Take full advantage of your boilers thermostat. One reason the thermostat display might read blank its because the circuit breakers on your central air conditioner or furnace might have tripped. This simple step alone resolves many thermostat issues. Try replacing the batteries on the thermostat. For any of th...