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Garland runaway

Question asked by sundog on Jul 2, 2019
Latest reply on Jul 3, 2019 by olivero

I apologize for the lack of detail here, I haven't yet gone to the site and I'm trying to recall the information from my scattered mind that is still away on holidays!


A customer has called me regarding a Garland Master Series 300 Convection oven (Nat Gas).  (this is an oven I reconditioned a while back and was sold as a used unit)


The issue he is having is the following:


He will leave the unit on overnight @ 150F to dry out product.  When he comes in the next morning and opens and closes the doors, the oven starts heating up, and goes until it reaches 400f even though he hasn't touched the thermostat.


The only thing I can come up with off the top of my head is that the thermostat is defective, or maybe the bulb is loose and touching the oven, would a bad potentiometer do this? However if thats the case why would it work all night long?  Or why does it work during dinner services.  Why is it the only time he has trouble is when he has it set to a ridiculously low temp and opens and closes the doors?


I'm just looking for ideas before I head here later this week, as I cant think of anything off the top of my head and I hate to walk in and look foolish.  I also don't want to replace a thermostat on my gut instinct alone if theres possibly something else I could be looking into.