Marshall Air Systems Food Warmer Troubleshooting

Problem

Possible Cause

Solution

No heat

• The unit is unplugged
• The circuit breaker is tripped
• The cord is defective
• The controller is set to “OFF”
• The infinite controller is defective

• Plug in the unit
• Reset the breaker and call an electrician if it trips again
• Have the cord replaced by an authorized service technician
• Turn the controller to “ON” 
• Have the defective infinite controller replaced by an authorized service technician

Low product temperature

• The infinite controller is set too low
• There are excessive air drafts

• Adjust the controller to a higher setting
• Shield the unit from drafts or move the unit

Problem

Possible Cause

Solution

There’s no heat

• The unit is unplugged
• The circuit breaker is tripped
• The power cord is defective
• The controller is “OFF”
• The solid state relay is defective

• Plug in the unit
• Reset the breaker
• Have the cord replaced by an authorized service technician
• Turn the controller “ON”
• Have the solid state relay replaced by an authorized service technician

Low product temperature

• The temperature is set too low
• There are excessive air drafts

• Adjust the temperature to the desired setting
• Shield the drafts or move the unit

Error code: “OPN” “UP” or “LO”

• There’s an open sensor: either the upper “UP” or lower “LO” sensor
• There’s a loose sensor connection

• Have an authorized technician replace the sensor
• Secure the sensor connection

Error code: “SHT” “UP” or “LO”

• A sensor failed “SHORT”

• Have an authorized technician replace the sensor