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  1. L

    Vaillant echTEC Plus 838H over pressurising

    Hello. Not to long ago I took off a radiator to paint behind, since I put it on for about 2 weeks the pressure kept dropping to zero, I topped it up when I noticed it had happened, then 1 day it over pressurised and went to max, I then released some water out of the radiator, this happened a...
  2. abc_plumb

    Biasi Riva Plus He 28C - No hot water

    Boiler: Biasi Riva Plus He 28C Erp GC: 47-583-42 Serial No: N056941117 Hi fellow engineers Need some help on this boiler please. Boiler works fine for central heating, but as soon as hot water is turned on, all the fault leds flash, middle red lock out led solid. There was another fault...
  3. W

    Vaillant ecoTec Plus 630 boiler not reaching target temp

    I recently had a new 2023 Vaillant ecoTec plus 630 (30kW) system boiler installed along with a Low Loss Header (LLH) in my house. I have 21 rads in the house and a room with UFH. The LLH was introduced as I was finding (before the LLH was fitted) that my old boiler (Vaillant heat-only boiler)...
  4. T

    Vaillant eco plus 837 System loosing pressure.

    I have a Vaillant eco plus 837, year installed 2008. It works well. We have one large zone for the house with 13 rads running off it. We also have an UFH zone in the kitchen. Near the boiler I have 2 port valves which control this part of the system. The boiler has been loosing pressure...
  5. B

    Problems with Worcester Greenstar HE Plus

    Started getting a random F7 fault on our gas boiler, called out a gas engineer to have a look at it. He gave it a good look over and checked and it was working while he was there. A few hours later the problem started up again, called the gas engineer who fitted a new main board, boiler was...
  6. 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...
  7. Beshman

    Need new Thermostat for 2016 Ideal Logic Plus Combi 30

    I've got a 2016 Logic PLus Combi 30 and a Salus RT505TX RF Thermostat The thermostat seems to keep losing connection, no matter the placement. It can be next to the boiler or in the next room and it still not get a connection. Just a weird blackspot in the kitchen blocking it (could be the...
  8. 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
  9. E

    eco tec plus 831 boiler wont turn heating on - controller is dead

    I cannot turn my heating on. the CM921 controller is dead despite changing the batteries. can i turn the heating on via the boiler directly?
  10. boxer01

    VR33 Install on eco tec plus

    Hi I am new to this forum and would like some advice on fitting a vr33 open therm module on a vaillant ecotec plus controlled by a nest 3rd gen. It's a basic heating system with no hot water control. I am having difficulty finding an installation guide for the vr33, I have read that it plugs...
  11. 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...
  12. B

    Watchman Plus Reset even after batter change

    Watchman Plus plug monitor showing “r” so replaced 4 x AAA in power tube and measured 6.3V at connector. After switch on, monitor displays serial number then remains on “r”. I have carried out battery replacement before, with no problems. Any ideas where to look next? Cheers
  13. 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...
  14. 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...
  15. M

    Buffer Tank/Thermal Store addition to S Plan Plus & Unvented Cylinder?

    Hi sorry bit of an odd query here. With the increases in energy costs now and in the future we are trying to find any way to reduce our exposure (retired couple on fixed incomes). We are fortunate enough to have bought solar panels at the beginning of the year but as we head towards winter the...
  16. T

    Valiant Ecotech Plus 637 - Error F76

    A couple of weeks ago my Valiant Ecotech Plus 637 displayed Error F76. Boiler is 13 years old; serviced annually. I power cycled the boiler and it operated for ~10 days before hitting the same error again; I once again power cycled the boiler and it was in operation for ~24 hours before...
  17. C

    Worcester 35 HE plus boiler/ tr2 thermostat controller replacement

    Ive moved into a house with a worcester greenstar 35 HE plus boiler in the garage. The TR2 thermostat controller is hanging loose on the wall in the living room, and is faulty. I want the TR2 replaced with a controller i can set a timer on, either digital or mechanical, the TR2 has three wires...
    • Catherine w
    • Thread
    • boiler plus replacement thermostat worcester
    • Replies: 2
    • Forum: Boiler Advice Forum
  18. O

    Vaillant Ecotec 630 plus replacement

    I have a Vaillant Ecotec 630 Plus that was installed in 2007 that is connected to a 300 litre unvented tank. This provides our hot water and feeds 4 floors of underfloor heating. I am looking to replace both the boiler and tank and see they still produce this boiler. I assume the newest models...
  19. 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...
  20. 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...

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