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  1. J

    Ecotec Plus 831 turning on randomly

    Morning all, My Vallient Ecotec Plus 831 is stored in the loft and is connected to Hive. It is coming on randomly at various times of the day, but particularly middle of the night, and staying on until I manually turn the boiler off. Hive schedule is switched off but still comes on. Had an...
  2. Z

    Boiler Pressure Keeps increasing - Vaillant Ecotec Plus 838

    Hello everyone, I have a Vaillant Ecotec Plus 838. The issue i have is after the heating is switched on and then left it to cool over night i see the pressure has gone up. For example yesterday it was set at 1.3 heating was switched on and when it reached its temp it went upto 1.9 so no issues...
  3. Ambienz

    URGENT Valliant Boiler - pls help troubleshoot

    Hi, Have a Valliant Ecotec Plus 637 system boiler that is showing no error codes and S.0 (no demand for heat), but it is not heating. Have checked that it is receiving switched 240V heat demand from controller into PCB, so believe it's just a boiler issue. Boiler was working fine up until...
  4. P

    Hi all, how to convert to lpg the vaillant ecotec plus 618-2018

    Hi all, how to convert to lpg the vaillant ecotec plus 618-2018
  5. R

    What is ideal pump size for Vaillant ecoTEC Plus15kW Heat Only Boiler?

    What is the ideal pump size for Vaillant ecoTEC Plus 400 15kW Heat Only Boiler? The property is a studio with 1 large room, a small kitchen and a small bathroom. I've been advised to use Grundfos UPS3 15-50/65-130.
  6. I

    Vsmart graph doesn't look good

    Hi all, I have an ecotec plus 832 and less than 2 weeks ago I installed a Vsmart thermostat by myself. The graph under information in the app doesn't look quite right to me and it looks like the boiler turn on/off instead of doing modulation. Am I missing something? Thank you.
  7. B

    Nest not connecting to Heatlink, smell a little gas around boiler

    Hi we came home this afternoon to our Nest not connecting to the Heatlink and we can smell a little gas around Vaillant Ecotec plus 630. Tried a number of times to get the nest to connect to the heatlink, but it will not. We can use the heatlink override to get heating and hot water on, but...
  8. M

    Valliant ecotec plus 415 hot water problem

    Basically, i have a hot water tank up in the loft when its summer the tank gets hot, and i have hot water from the taps. However during colder months i try and turn the water temp on the boiler to the max, i heat it up for 2 hours and it does nothing. However when the heating knob is turned up...
  9. V

    Vaillant Ecotec plus 428 No heating

    Hi We've got a Vaillant ecotec plus 428 that doesn't seem to want to supply any heat to the radiators despite the hot water working just fine. Of some importance (I think) is that there is no radiator symbol displayed on the boiler screen, only a tap. We have a wireless thermostat (Altech...
  10. P

    Vaillant Ecotec plus 428 overactive. Keeps running in S7 and S8 mode.

    I have an open vented central heating system with a hot water tank. Both heating and hot water circuits have a motorised valve controlled by a timer. The timer for the central heating is always in the “on” position and is governed by a room thermostat. The boiler is a Vaillant Ecotec Plus 428...
  11. N

    No hot water - Intermittent - ecoTec Plus

    Woke this morning to no hot water but heating was working fine. Checked the forums and checked all the common problems: Water and boiler pressure both ok Timer ok (hot water set to all day) No leaks and condenser pipe not frozen No error codes Tried running hot water with heating turned off...
    • Nikkilou
    • Thread
    • ecotec ecotec plus hot hot water intermittent no hot water plus water
    • Replies: 3
    • Forum: DIY Plumbing Forum
  12. J

    Valiant Ecotec Plus 938 A - Losing pressure (losing my mind!)

    Good afternoon. I am hoping someone may be able to help with an issue I have on a Valiant Ecotec Plus 938 boiler. Fitted approx 4 years ago, the boiler has been suffering from the loss of pressure on the system (down to 0) at least once a day, typically when it is not in use. I have so far; 1...
    • Justin01981
    • Thread
    • ecotec ecotec plus losing plus pressure valiant
    • Replies: 3
    • Forum: Central Heating Forum
  13. S

    Vaillant Ecotec Plus 832 Expansion Vessel

    Hi Guys, Had a quick question regarding expansion vessel on a Vaillant Ecotec Plus 832. Was servicing the boiler and upon attaching hand pump to vessle after having drained the boiler, returns and flows isolated and drain off on boiler open, the vessle showed 1 bar charge. Was wondering why...
  14. B

    Vaillant ecoTec plus 637 System boiler control options

    Vaillant ecoTec plus 637 and gledhill 250 indirect tank control options Hi, I am in the process of renovating an old farm house. I have been advised to have installed the Vaillant ecoTec plus 637 system boiler with a gledhill 250l indirect tank. I met with the heating engineers yesterday as...
    • Blondie44
    • Thread
    • boiler control controls ecotec ecotec plus options plus setup system system boiler vailant vaillant wireless
    • Replies: 11
    • Forum: Central Heating Forum
  15. B

    Vaillant ecoTec plus 637 sensiocomfort control setup

    Vaillant ecoTec plus 637 and gledhill 250 indirect tank control options Hi, I am in the process of renovating an old farm house. I have been advised to have installed the Vaillant ecoTec plus 637 system boiler with a gledhill 250l indirect tank. I met with the heating engineers yesterday as...
    • Blondie44
    • Thread
    • america comfort control ecotec ecotec plus plus sensio setup system boiler usa vaillant
    • Replies: 0
    • Forum: USA
  16. J

    F.22 Vaillant EcoTec Plus 630 - can't locate filling loop

    Hello - I have an f.22 error on this system boiler, 0.4 bars. Just moved into this house so not certain on how everything works. There are no taps under the boiler to add more water. There is a hot water cylinder in the cellar so thankfully it's just heating that we have lost. With this...
  17. S

    Vaillant EcoTec Plus 938 temperamental in heating mode

    Hello, we have a Vaillant EcoTec Plus 938 boiler and it started behaving when running in heating mode (hot water is fine - no problems with that). The problem is that quite often when there is demand for heat (either from one of Hive TRVs or from under floor heating thermostat) boiler starts...
    • skvortsov
    • Thread
    • america central heating system ecotec ecotec plus heating plus usa vaillant
    • Replies: 47
    • Forum: USA
  18. S

    Y plan with Vaillant Ecotec plus OV430

    Can Someone tell me how to wire the Vaillant ecotec OV430 with the Y Plan system. Does the orange from terminal 8 junction box go to the RT terminal on the boiler (room thermostat)
    • Stevie B
    • Thread
    • america ecotec ecotec plus plus usa vaillant y plan
    • Replies: 2
    • Forum: USA
  19. D

    Vaillant ecoTEC plus 637 with Nest or maybe SensoHome

    Hi, A newbie here but need expert advice, I have installers who have started fitting the boiler (Vaillant ecoTEC plus 637) replacing an old water tank loft system and cylinder in the cupboard I'm also installing a horizontal megaflo (tempest) Okay, so they purchased the Valliant vsmart kit...
    • dwaindigital
    • Thread
    • america ecotec ecotec plus maybe nest plus sensohome thermostat usa vaillant
    • Replies: 21
    • Forum: USA
  20. V

    Ecotec plus 824..F28.

    Hi anyone. I have the F28 code on this unit. Gas IN is fine and on start up fires but within a second or two, the gas valve shuts. Taken the valve apart and the diaphram is ok,no splits. S code runs thru 1, 2 & 3 but will not progress to 4( burner ignited). Checked the low voltage solenoid and...
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