Thetford fridge slow to get cold on gas

PandJB
PandJB Forum Participant Posts: 1
edited August 2013 in Caravan & Motorhome Chat #1

We have a Thetford N80E fridge and when on gas, it takes several hours (maybe as long as 12) to get down to a correct temperature.   It is fine when on electrics. Anyone got any suggestions please.  The fridge is 7 years old and does not have a digital display
panel.