Great this web site exists to handle an issue for me...
My daughter has just brought a flat with an old gas fired Vokera boiler, that has an "S" configuration with independent heating of water and heating. I know at some time it needs to be changed out for a new boiler, most likely a Vaillant per my own house, but in the meantime a problem that I'd welcome advice.
When I set the heating for either "once" or "twice" at the required time the control panel light comes on and I think the fan comes on in the boiler, and maybe the pump ( a whirring noise anyway). However it takes 15 mins before the boiler actually fires up and it does this pretty consistently time wise. Once running its fine but I wondered if anybody could point me towards the most likely cause.
Note I can't find a room thermostat so I don't think that's the cause.
Comments appreciated.
cpoh
Got a credit card? use our Credit Card & Finance Calculators
Thanks to Anonymous,bruncher,niord,gvonge,Shelford, for Donating to support the site
Delay in Boiler Firing
-
- Posts: 8
- Joined: November 6th, 2016, 8:40 pm
- Has thanked: 34 times
-
- Lemon Quarter
- Posts: 1007
- Joined: November 8th, 2016, 2:20 am
- Has thanked: 130 times
- Been thanked: 196 times
Re: Delay in Boiler Firing
You may find details of your boiler here:-
http://www.vokera.co.uk/trade-professionals/manuals-literature/#discontinued
A faulty air pressure switch or a slow-running fan not building up sufficient pressure in the boiler casing?
The latter may also be caused by a casing-seal leak.
http://www.vokera.co.uk/trade-professionals/manuals-literature/#discontinued
A faulty air pressure switch or a slow-running fan not building up sufficient pressure in the boiler casing?
The latter may also be caused by a casing-seal leak.
-
- Posts: 8
- Joined: November 6th, 2016, 8:40 pm
- Has thanked: 34 times
Delay in Boiler Firing -now pump overun issue
Thanks for the comments Supremetwo which meant that I was ready to call the local heating engineer.
You were almost right...He found a blockage in the heating manifold which apparently was preventing a satisfactory vacuum being produced - hence the delay in firing. Fortunately that problem is now solved, but sadly there's another issue that has arisen. Don't know if it was pre-existing.
Now on shutdown of the boiler, there's a severe case of pump overrun. (sometimes the pump runs for hours, but it seems to be weather dependent as to whether it does that). A web search indicates a boiler thermostat issue.
http://www.tertullian.org/rpearse/heating/overrun.htm
Does that make sense?
Note that there is no frost stat or room thermostat installed and I've just had the motorised valve on the water system changed out which was another likely cause.
ps. Its a Vokera Mynute 28/96 SE sealed system, with "S" type configuration.
Thanks,
cpoh
You were almost right...He found a blockage in the heating manifold which apparently was preventing a satisfactory vacuum being produced - hence the delay in firing. Fortunately that problem is now solved, but sadly there's another issue that has arisen. Don't know if it was pre-existing.
Now on shutdown of the boiler, there's a severe case of pump overrun. (sometimes the pump runs for hours, but it seems to be weather dependent as to whether it does that). A web search indicates a boiler thermostat issue.
http://www.tertullian.org/rpearse/heating/overrun.htm
Does that make sense?
Note that there is no frost stat or room thermostat installed and I've just had the motorised valve on the water system changed out which was another likely cause.
ps. Its a Vokera Mynute 28/96 SE sealed system, with "S" type configuration.
Thanks,
cpoh
-
- Lemon Quarter
- Posts: 1007
- Joined: November 8th, 2016, 2:20 am
- Has thanked: 130 times
- Been thanked: 196 times
Re: Delay in Boiler Firing -now pump overun issue
cleanpairofheels wrote:Thanks for the comments Supremetwo which meant that I was ready to call the local heating engineer.
sadly there's another issue that has arisen. Don't know if it was pre-existing.
Now on shutdown of the boiler, there's a severe case of pump overrun. (sometimes the pump runs for hours, but it seems to be weather dependent as to whether it does that). A web search indicates a boiler thermostat issue. cpoh
A not uncommon fault.
Perhaps the circulating water is running hotter now that the air pressure is correct.
Is that noticeable on the rads?
Re: Delay in Boiler Firing
No help with the cause of the problem, but Vokera have an offer of a fixed price repair, which I have taken advantage of for my own 17 year old boiler. I paid 257 euro (not sure what the price is in the UK, but it can't be that far different) and this includes all parts. Cheaper than a new boiler, and, although Vokera are not the best, they are not terrible, either.
Who is online
Users browsing this forum: No registered users and 21 guests