Hi, the thermostat for our Vaillant ecotech 831 boiler stopped working. The engine who came out claimed to have left the heating on but we have returned from holiday to a cold house. He comes back tomorrow to fit a new thermostat but how do I force the heating on overnight? The usual on /off mechanism is only via the thermostat but there must be a way to do it at the boiler! Nothing in the instructions.
Hi, I would like to offer some help. First, a thermostat is a low voltage switch. It tells the primary power control on your boiler that it needs to heat "switch on" or that it is at desired warmth, "off". If the engineer told you that heat was left "on", then heating would not stop. The system would run continually. This is not a wise or common practice. Unless a temporary thermostat was provided, there would be no way to "switch" your furnace on and off to maintain desired temperature. My advice is to look where the thermostat is located and see if it has been removed. Is wiring exposed? Please be careful, one may be "hot" if not covered. In any case, also check near the heating unit (boiler) to see if a temporary thermostat was patched in. If so, adjust the settings to call for heat, making sure it is in "heat" mode and thermostat turned up. Please let me know if you need further assistance with this matter.
This isn't even an answer. I gave you the boiler model nand that it is a wireless thermostat and yet the answer was completely generic.