Hobart oven model GN90A

[fixbear]

Sorry to hear that your oven is not lighting.  What you describe means that the oven is getting spark, but no ignition.  Not knowing your capabilities, or what you have available4,   please register for the site so I can talk you through troubleshooting this.

 

 This oven is built by Vulcan for Hobart. It will probably have a Fenwal gas control.  Hobart does not share service information, only parts list.  However, if you know if this is a half size or full sized oven and the age,  It should be easy to cross to a Vulcan design to fugue out the ignition system.

 

This is a common Vulcan service procedure.

 

No gGas ignition – sparking occurs 1. Remove the right side panel as outlined under “ COVERS AND PANELS .2. Plug in the unit and set the temperature controller to 350. 3. Turn the power switch on. 4. Check for 24 VAC between the gas valve terminal and the ground terminal. The voltage should be present after the 15 second purge and during the 10 second ignition period. A. If 24 VAC is present, check the gas valve and gas supply. B. If 24 VAC is not present, replace the spark ignition control

[ectofix]

That’s the one with the burner assembly in the rear, uses a, inducer blower motor and a in-shot burner, right?  I do not recommend anyone attempting any DIY repairs on that oven unless you REALLY know what you’re doing. 

 

My previous company got called to look at one of those that had a gas accumulation which had explosively blown the doors open due to someone’s improper repair.  It was violent enough to actually break one door away from a hinge-point.  More importantly, an employee at the restaurant had to be taken to the hospital and suffered permanent hearing loss.

This wouldn’t have happened if it’d been repaired correctly.  As with ANY gas-fired appliance, system safeties are designed to prevent such an occurrence.  However, that system had been circumvented by whoever performed the previous maintenance on it.

[fixbear]

These ovens didn’t last long.  They were arguably one of the most dangerous gas designs made.   There was a centrifugal proofing switch on the draft blower.  And the burner L shaped heat ex changer area was minimal for the BTU’s  involved.   As I recall, they had a problem with the centrifugal not opening if the fan slowed down  and changed mixture.  Then they would carbon up and plug the heat ex-changer. That’s when they made the boom