Oven is not getting to temp

I have a 2014 Burford the oven doesn't get up to temp.
The flame starts really high and stays like that, it doesn't cut back when the temp set is reached , it still will not get up to any decent temperature, put some chicken legs in, set oven on 6  and a hour later they were still not cooked.
anyone else having the same problem.

I had the same problem in an oven, it turned out that the glass wasn’t fitted correctly....I purchased an oven thermostat to check what temperature I was actually getting 

Ray

Thanks Ray.
What am I looking for if the Glass is the problem

Is heat leaking from around the edges of the door, in which case you likely need a new door seal. I assume it is a crapice oven?

Groundhog Thanks, the seal on the door looks good and in good condition.

After substantial investigations, I have discovered it amazing how anything gets cooked properly in these Thetford caprice Mk 3 ovens.
Testing involved accurate temperature measurement of the Top and middle of the oven .
My investigation also turned up something surprising. to get the best temperature from your oven it is best to set your oven Temperature much higher than required ,once higher temp is reached turn the oven down to the  required temperature ,  turning the oven down to the temp instead of turning it straight up to the correct temp gave an extra 20 deg c in the oven.
The following are the Temperatures that was measured when reducing the set  temps from
 Gas 9.                         All temps are Deg C
Gas mark       Temp for gas mark              actual temp middle           Actual temp Top
    1                       140                                     125                               170
    2                       150                                     133                               182
    3                       165                                     140                               194
    4                       177                                     159                               217
    5                       190                                     169                               232
    6                       200                                     174                               242
    7                       220                                     190                               267
    8                       230                                     196                               272
    9                       245                                     208                               284

Hope this helps the next time you do pizza and oven chips.

We have a 2015 Beckford with the same oven 
After a similar experience my wife advises to move the oven rack higher and cook on the 8 setting. Oven now cooks very well

Its a matter of familiarity, I have no problem with the Caprice in the van but my wife does - guess who uses it most?

We had the reverse problem with the Bosch fan oven at home, measuring temperature as above it was found to be around 15°C above what it was set at.