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Thread: EvoHome Hot water temperature incorrect

  1. #21
    Automated Home Legend paulockenden's Avatar
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    The pockets (why do we call them pockets? They are tubes) for the sensors are under the incredibly flimsy grey plastic cover, and the stats.

  2. #22
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    Quote Originally Posted by Jemster View Post
    Ok, I gotta say I thought the same as Fezster.

    If we call the plastic fascia 'North', the round circle has 4 'features', East and West are terminals with wires - I assume these are the immersion heater circuit. North and South appear to be holes with what looks like something black pushed into each with 2 wires coming from each - I thought these were the stats.

    I haven't taken off the top plastic fascia, it seems to cover the immersion and boiler stat settings and reset buttons. I'm not denying there's further pockets under that section mtmcgavock, I simply haven't looked yet.

    The photo was a hi-res closeup, I didn't realise the board scaled it down and rotated it 90 degrees! (at least, I can only assume that's how it got to postage stamp sized!)
    That's it - "North" and "South", as per your description, contain the stats. The 2 wires in each correspond to the overheat stat (which will be spring like and inserted furthest into the pocket) and the immersion/cylinder stat (which will be a 3 to 4 inch long NTC). Take your pick on which pocket you want to use, but you can definitely squeeze one more stat in there, albeit it is quite tight.

  3. #23
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    Quote Originally Posted by mtmcgavock View Post
    I think youíre misunderstanding what I meant by top plastic cover. Iím meaning the plastic fascia with 3 screws in within the bottom compartment. This holds the immersion and boiler stats in place are and where the relevant probes/pockets will be for each stat.
    Ok, I'm not sure I have this plastic cover. If I remove the lower grey cover on the cylinder, this is what I see - you can see the 2 dry pockets and the wires leading into them with the stats.

    megaflo stats.jpg

  4. #24
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    Fezster, that’s about the same as mine. Today I got the sensor tucked up against the cylinder wall with some polystyrene holding it tight. The readings have gone up by 6-7 degrees, close, but not quite there yet. Going to order up some thermal paste - I thought I had some but it seems to have disappeared. No doubt it’ll show up as soon as the new one arrives
    If there’s still a little discrepancy I’ll compensate by adjusting the evohome target temperature a few degrees.

  5. #25
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    Just for the sake of thread completeness ... as mentioned previously, thermal paste is the key. I took out the sensor, smeared it liberally on the contacting side with some very conductive thermal paste and tucked it back into the same spot. The temperature readings are now matching between the sensor, and the tank water outlet pipe after I've run a hot tap for a minute.

    Thanks for all the help, that's one more gremlin out of the system.

    Hasn't made any difference with the gas consumption, but at least I now know it's not caused by the hot water cylinder.

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