Main / Baxi E133 Fault during low temperature in away mode

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icarusbon
icarusbon ✭
in General Questions & Topics
I had my V3+ kit on with newly installed Main Compact Eco combi boiler. It was working really good on the first few days, while I set it at 20 degrees. However, when I turn it down a bit at night or away like 17 degrees. The ignition light didn’t turn on and it fails then. I checked and observed a few times and found that it happens when the controller gives instructions to boiler that a minimum gas is needed to maintain the temperature, but the same time boiler finds it’s dangerous as it fails below the minimum gas level / pressure.

Can I do some settings in Tado so some modulations are limited or it can switch to on/off only?

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  • johnnyp78
    johnnyp78 ✭✭✭
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    How is your Tado device installed? If it’s wired in via relay it will be just be telling your boiler to turn on and off anyway. There should be a way to turn up the maximum flow temp on the boiler.

    If it’s installed on a digital modulating connection you can try turning up the maximum flow temp on the Tado pro app or on the boiler and see if that makes a difference.

    Do you have Tado trvs on all your radiators? If so you might need to have one radiator without a trv to act as a pressure bypass. It sounds to me it’s more likely that the boiler is locking out due to a pressure build up but I could be wrong.
  • icarusbon
    icarusbon ✭
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    It’s connected to my boiler directly with 4 wires by the professional. I am not sure if it is modulating instead of on/off but this is what I was told when I go to the app for a look.

    So far I set the heater to maximum at 80 degrees. But I cannot find anywhere I can change the settings in the app. There are 4 output level and I believe that the problem happens only with the lowest level.

    I don’t have any tado TRV yet nor any other smart TRV. They are all traditional ones that I am planning to replace soon.
  • johnnyp78
    johnnyp78 ✭✭✭
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    I’m guessing the four wires are l, n, + and -. If you download the Tado pro app you can lower the maximum flow temp, though I’m not totally sure that’s the issue. Instructions here

    https://community.tado.com/en-gb/discussion/8611/release-opentherm-max-flow-temperature-setting/p1
  • icarusbon
    icarusbon ✭
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    I checked and now it is in relay mode rather than OpenTherm. It seems something wrong with the gas supply but I am not sure yet. When I turn the heater on, it takes more than one minute for the ignition light on, and so as the gas meter starts counting. I don't know why the boiler cannot intake gas properly when it first starts, and I have asked the installer to come again to check.


    Thank you very much Johnny for your kind support!

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