Heater/thermometer Problem?

[khial]

Hi,

right... this is going to be one of the dumbest things ive asked but here goes.....

my heater is set at 26°c but my thermometer has been slowly going up and now reads 30°c (heater still at 26°c)

will i be right in thinking, get a new thermometer? (its one of the little glass ones by the way)

 

[CezzaXV]

I'd be more inclined to say it's the heater that's wrong rather than the thermometer, but thermometers are far, far cheaper to replace so I'd get a new thermometer and check before shelling out for a new heater.

Is there anything else nearby your tank that might cause such a rise in water temperature? Radiator, lights etc?

 

[khial]

no nothing near the tank, no lights (except aquarium lights obviously) nearest radiators 4 ft away.

yea thats what i feared having to replace the heater, but shall try the thermometer first.

could i try turning the heater down in the meantime see if that works maybe to 24?