After a power cut, the timer clock on my Vaillant Ecotec plus 837 has stopped. I've tried turning the boiler on and off but that hasn't worked. The user manual has nothing about the timer at a

Cannot find the fault code . There are vidoes on u tube saying how to reset thr code By pressing the reset button . If this does not work youcan ccontact vaillent on there web page . I have a mate who works for them i will ask him as well

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Hi

Got a valiant 350f for valiant ecotec 831 boiler receiver light is green but cant get it to turn heating on please help with pairing ?

you might have a small cold water leak

We have just had our old system boiler replaced with a vaillant ecotec plus 837 and sounds like a similar working operation to ours. At first I was a little concerned,but I was told by our installer that he was told by vaillant that these very latest boilers size the system on start up for about 10 mins, then take temperature to target flow which you set boiler at. So even by setting target flow temperature very high you still get the initial sizing cycle, which ours was about 30-35c temp. These boilers seem to run biased for efficiency as after a while they modulate the boiler burner down and the radiators run more on the side of warm than really hot like the old type boilers. You also get better efficiency as at lower temperature the boiler condenses better. You will also find you get a more constant temperature in your home rather than over shoots. I was concerned at first, shame there was no info/explanation in user manual as people do need to know that this is normal operation. We are used to ours now, took a month and by the way these boilers can make a creaking noise but was told this normal expansion/ contraction but annoying when sited in bedroom cupboard. Best of luck!

most likely no. there might be a obstruction in the blades, dirty filter, the motor might have a bad berring , the fan blades might have bent and now are touching the housing prob should call a trained tech boilers aint no joke

F.49 eBUS undervoltage Short circuit on eBUS, overload on eBUS or two power sources on eBUS with different polarity F.61 Gas-valve control defective Short circuit/earth (ground) leak F.49 eBUS undervoltage Short circuit on eBUS, overload on eBUS or two power sources on eBUS with different polarity F.61 Gas-valve control defective Short circuit/earth (ground) leak i pasted the answer below hope it worked

try to enter here all informations and you can find the manual: http://instructions-manuals.com/search.php?cmarque=VALLIANT%20&modele=ECOTEC%20PLUS%20824

check to see the time clock is set with the clock symbol. there are three settings on analog clocks I , O and clock the I setting is constant running, the O setting is off and the clock setting is timer.
also try setting the thermostat up higher to see if the boiler fires.