Middleby Marshall Pizza Oven Troubleshooting When it comes to making pizza, Middleby Marshall manufacturers some of the best ovens in the industry. In the rare case you ever experience an issue, it can put a halt on your commercial kitchen. Fortunately, we have some quick Middleby Marshall pizza oven troubleshooting tips, including WOW! conveyor and traditional impingement models. This guide helps you properly identify symptoms and alerts you to when you should contact an authorized service technician for help.
Middleby Marshall Pizza Oven Troubleshooting Solutions
The troubleshooting tips in this are applicable for the following traditional impingement and WOW! conveyor models:
- Traditional Impingement – PS520, PS528, PS536, PS540, PS555, PS570
- WOW! Conveyor – PS310, PS314, PS360, PS360GWB, PS624, PS628, PS636, PS670
Issues & Potential Causes
Product is Overcooked or Undercooked
The following issues could be present whenever product is either overcooked or undercooked.
- Conveyor speed setting is incorrect – Check if the conveyor speed control is at the proper setting.
- Temperature setting is incorrect – Change the temperature control to the correct setting.
- Food isn’t prepared properly – Make sure you and your staff are preparing pizza or other products properly and that ingredients aren’t too frozen or warm prior to being cooked.
- Burner shuts down – When the “OVERTEMP” light comes on and product is undercooked, the oven’s temperature has exceeded 650 degrees Fahrenheit and the burner automatically shut down. Follow the “Daily Shutdown Procedures” in your owner’s manual to shut down the unit. Contact an authorized Middleby Marshall technician to determine root cause and repair.
Oven Won’t Heat
Whenever the oven isn’t heating properly, look for the following issues:
- Switches are off – See if both the BLOWER and HEAT switches are in the on position (“I”).
- No gas pressure – Check if the main gas is on in your facility.
- Burners aren’t lit – If the burners aren’t lit, turn off the oven and restart it.
- Controls aren’t set correctly – If there is still no heat in the unit, contact an authorized Middleby Marshall technician for assistance.
Oven Won’t Heat When Blower and Conveyor Work
If blower and conveyor are operating but the oven won’t heat to 200 degrees Fahrenheit in 15 minutes, turn the BLOWER switch to off for about 30 seconds. After you turn the BLOWER switch back on, set the temperature controller to a setting above 200 degrees Fahrenheit. If the unit still won’t heat, contact an authorized Middleby Marshall technician for assistance.
Oven Won’t Turn On
If the oven isn’t turning, confirm that all electrical switches are in the on position (“I”) before starting the unit. If the oven still isn’t starting, contact an authorized Middleby Marshall technician for assistance.
Blower Motor Runs With Little or No Air
If the blower motor runs in the oven but produces little or no air from the air fingers, it’s possible that the air fingers were assembled or reinstalled incorrectly. Refer to your owner’s manual for proper assembly or contact an authorized technician for help.
Conveyor Won’t Run or Hold at Proper Speed
If the oven’s conveyor isn’t running or is running with a jerky motion, look for the following possibilities:
- Oven not at operating temperature – Give the oven time to preheat.
- Conveyor is obstructed – See if product or something else in the oven is jamming the conveyor.
- Conveyor tension is incorrect – Check that the conveyor drive chain and conveyor belt are both at the right tension. Refer to your owner’s manual for this procedure or contact an authorized technician for help.
Conveyor drive sprocket is loose – The drive sprocket might be too loose.