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vaillant

  1. 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...
  2. G

    Unable to adjust co2 readings vaillant boiler

    Unable to adjust co2 readings on a a vaillant ecotec boiler it’s an lpg model I’m currently getting 0.0004 ratio, can’t get a higher co2 percentage than 8.6% (minimum being 9.7 without cover) and the ppm is around 40 Have tried new gas valve new Venturi and new pcb. I’ve cleaned burner and...
  3. L

    Vaillant ecotec 831 F61 fault

    Just wondered if anybody could help me with this one....... or advise... Called out to an ecotec 831. fault code F61. The gas valve had been changed by a third party a week before... I checked the ignition electrodes and they were caked in sh*t. Cleaned and fired back up. Advised...
  4. P

    Replacing entire filling loop on Vaillant EcoTec Pro 28

    Hi all, I think has been discussed before but I don't think I've seen a clear answer. We have the Vaillant boiler as above and the filling loop has started to leak from around the olive joint on the cold water side. I would like to replace the whole loop, flexi, taps and the valves etc. I can...
  5. 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)
  6. 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...
  7. J

    Which Inhibitor for Vaillant Ecotec ?

    Had system drained and replaced 3 rads. Just wanted to know is any inhibitor ok or does vaillant have a recommended brand?
  8. No More Heroes

    Vaillant Ecotec Pressure Too High

    I have a Vaillant Ecotec plus 637 boiler. The pressure is very high and pegged to the right - water is dripping out of the outside overflow through the Pressure Release Valve. An engineer has replaced the expansion vessel and checked the filling loop. The pressure gauge is still pegged. (Note...
  9. P

    Vaillant Boiler Size

    Hi, We have an ecotech plus 837 in our house that was originally over rated on installation. It was installed based on the hot water flow rate and told that the heating would modulate itself down accordingly. This is the case in very cold weather but not when its a bit warmer. It is now...
  10. Z

    Vaillant Ecotec Diverter Valve Repair Cartridge

    I've seen some replacement cartridges for Vaillant Ecotec diverter valves, just the innards. Aftermarket stuff, not official, and I know you're supposed to use official parts and all that, but the diveter valves on Vaillants are probably the weakest part i'd say. Has anyone used them and had...
  11. T

    Vaillant F 83

    Hi My Vaillant boiler constantly show F83 and has done since installed 2.5 years ago. The installer seems unable to sort it. A vaillant engineer said the water is taking too long to transit because the radio control is too slow. Control now hard wired but problem remains. Any suggestions?
  12. D

    Vaillant Boiler ecoTEC+418 - Status Code S46

    Live monitor is giving me status code S46 (Comfort Protection minimum load loss of flame). Symptoms are boiler taking longer to come on and takes longer to heat rads, although it gets there in the end. Flame is lower on symbol and boiler quieter than it was. Anyone got an idea of why the...
  13. E

    Excessive hot water time in vaillant 938 boiler

    Hi everyone. We have just moved into a new house with a vaillant ecotec 938 combi boiler. The boiler is in utility room downstairs next to kitchen. Hot water comes out of the downstairs tap in approx 2 seconds. However upstairs in the ensuite, it takes 80 seconds before the water becomes hot...
  14. S

    vaillant replacement fan use only on Italian appliance

    hello I've picked up a replacement fan for a valiant turbomax 242 and when I got it home it has a warning notice say use on Italian appliances only, but this one was made in Germany. Anyone come across this?
  15. D

    Vaillant ecoTec Plus 418 D0 Setting

    Could anyone please provide an idiots guide how to change the D0 setting on my boiler. When I open the panel I'm faced with four buttons Bottom two + and - top two - -. That would be a great starting point. My D0 setting is apparently D00 (auto) and to cut a long story short, my boiler has...
  16. S

    Vaillant Ecotec Plus 824 problem

    Just serviced a Vaillant Ecotec Plus 824 and after putting all back together and filling up got some issues. The burner keeps modulating between high and low ever few seconds when running hot water. I checked the inlet pressure and all is within parameters per MI. Heating came on for few...
  17. E

    Vaillant ecoTEC plus 824 actuator motor cycling

    Hi, as title says the actuator motor keeps cycling and sounds like the gears slipping. The pump is running freely and the diverter valve is running free. I have seperated the motor from the diverter valve and extended the motor piston. On powering up the boiler the piston retracts but then goes...
  18. R

    vaillant ecotec pro 28 - water temp not hot enough

    HI, basically I have had the boiler for 5 years and its never been serviced but never had any problems and the rads water is very clean, when we first got the boiler the hot water temp was set at 55oc and the the shower and tap water was scorching hot but gradually the temp of water has got...
  19. D

    Vaillant ecoTec 418+ Taking Longer to Reach Desired Temp

    Have noticed over the last view days the process has slowed considerably. Normally, the boiler fires up soon after the room stat clicks in and it gets up to desired temp within a few minutes. Have noticed the boiler is much quieter when it does ignite (approx 10 mins after being switched on) and...
  20. W

    Vaillant Ecofit Pure 830

    So I have a new installation of an Ecofit Pure 830 with a 10yr guarantee. Reading around, I need to set the CH temp to as low as I can get away with for max efficiency (max condensation), right, with the return pipe temp <55C as a starting point (measured with a thermocouple touching the return...

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