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  1. 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...
  2. 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?
  3. 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...
    • Dunbar
    • Thread
    • boiler vaillant
    • Replies: 5
    • Forum: Boilers
  4. 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...
  5. 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?
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. W

    Vaillant Ecofit Pure frost protection

    The installation manual says: Frost protection The appliance has a built in frost protection device that protects the boiler from freezing. With the gas and electric supplies ON and irrespective of any room thermostat setting, the frost protection device will operate the pump when the...
  12. 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...
  13. M

    Vaillant ecotec 24 not responding

    Vaillant ecotec went off this evening, just noticed, no response, not turning on and no error code. tried replacing fuse in plug, turns on for less than a minute then dead again. have repeated with new fuse and does the same. Any ideas?? Plumber says maybe pcb, he can check in the morning...
  14. S

    Vaillant Ecotec 832 pressure rise with CH on

    Hi Guys, Needed bit of help on a Vaillant Ecotec 832 which has a pressure issue. The boiler pressure is rising when the CH was running. I have checked the expansion vessle static and charge is showing 1bar on my pump, which I believe means the vessle is good or best to still recharge again...
  15. J

    Recommendations for Vaillant combi heating controls...

    Hi all, I could do with recommendations for heating controls. The customer is a small church/church hall - with a fairly new 30kw Vaillant Ecotec Pure. No heating controls (other than the inbuilt time clock) were fitted by the original installer. They've got two heating zones (currently...
  16. I

    Vaillant EcoTec 831 - How to configure for economy

    Apologies at start for long post but trying to give as much info as possible, Home - detached bungalow build 1989, cavity wall insulation, loft had extra in 2008, doubled glazed, 2 bedroom, 1 bathroom. Size is Width 35 feet, length 32 feet, room height 8ft. 7 Radiators installed 1995 plus 1...
  17. N

    URGENT Vaillant F23 fault Christchurch, Dorset

    My boiler has tripped out showing F23, British Gas came out two weeks ago cleaned out the pump and it worked but now has tripped out again. I need someone who can give the system a power flush. It is an open system with a hot water tank. Many Thanks in Christchurch BH23 4ER
  18. L

    Vaillant boiler - what do the buttons do, controlling the boiler, and opentherm

    Hi, I've got a "Vaillant ecotec pro 28 VUW GB 286/3-3", I think it's around 10+ years old or so. I don't have a user manual, and I can't find one for this model online on any of the "manual websites" on the internet. The control panel looks like this - see the attached picture. What do those...
    • louis_b
    • Thread
    • boiler vaillant
    • Replies: 5
    • Forum: Boilers
  19. 5

    VAILLANT ECO TEC PLUS 835

    Installed the above boiler today. They quote 14 ltrs per min hot water. Looking at the heat exchanger, it does not look any different in size to the 832 (well I know, its only 3kw more!), but comparing this to the 838, that heat exchanger is nearly double the size? and the flow rate on that is...
  20. S

    Viessmann/Worcester/vaillant

    I have done a extensive research and watched hours of videos about all of them and looking for the most suitable boiler for our house. The house is 5 bed, 4 bathrooms, 20 radiators and maybe in future underfloor heating, 5 people living here and very rarely we use more than one bathroom. Flow...
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