i have a vaillant eco max 824 boiler, there are no fault codes displayed but the heating is not working.ive tried resetting the boiler and turning the thermostat up but nothing seems to work.
I have a similar problem, I have found that there is nothing wrong with my boiler its the thermostat thats giving the problem, the only thing that seems to work is to switch the electric off that goes to the transmitter unit and then back on again.
If you have the installation manual, you can tell what the boiler is doing by pressing the i button and reading the (s) status codes, this will help in diagnosis.
If there is no radiator symbol in the window when heating is required and the bottom left dial is turned up, the fault will be external to the boiler (or possibly internal clock if it has one).
If the radiator symbol is there and the boiler fires for only a few seconds, you have a potential fault with the diverter valve.
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