Delfield Prep Table Error Code E02: Coil Sensor Defect
E02 on a Delfield NP prep table means the control reports a defect in sensor 2, which the manual's table marks as the coil sensor. The manual lists the indication only and gives no operator step.
Medium: the control has lost one sensor reading and the unit may still cool, but defrost control could be affected.
- Code
- E02
- Maker
- Delfield
- Equipment
- Prep tables
- Applies to
- 4400/4500 Series NP refrigerated prep tables with R290 temperature control (4424NP-4472NP, D4424NP-D4472NP, ST4424NP-ST4472NP and variants)
What does Delfield error code E02 mean?
The R290 control in a Delfield NP prep table uses more than one temperature sensor. The air sensor reports the box temperature. Sensor 2 is the coil sensor, which lets the control see how cold the evaporator is. If the control cannot read sensor 2, it shows E02 on the display. The manual's table calls this a sensor 2 defect and marks it as the coil sensor. No cause is listed beyond the sensor failing, and the manual gives no action for E02, so there is nothing on the operator side to reset. What the control does with a missing coil reading is not described in the section we use, so this page does not claim that the table stops cooling. The practical advice is to keep a thermometer in the food and have the sensor checked.
Affected models and control systems
The manual covers the 4400 and 4500 Series NP refrigerated prep tables with the R290 temperature control, including the 4424NP to 4472NP, D4424NP to D4472NP and ST4424NP to ST4472NP sizes and their variants.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- E02 on the display
- Frost building on the evaporator cover
- Box temperature drifting between defrosts
Possible causes
Listed in Delfield's documentation
- Sensor 2, the coil sensor, reported defective
Other likely causes — what usually sits behind error code E02 on this control. A technician confirms which one it is before any part is replaced.
- Coil sensor lead damaged by ice removal or cleaning near the evaporator
- Connector at the control loose after the unit was moved
- Moisture inside the coil sensor from repeated defrost cycles
Safe checks before calling for service
- Check the food temperature with a separate thermometer and keep an eye on it.
- Look into the box for heavy frost on the evaporator cover, without removing the cover.
- Note whether E02 stays on or only appears around defrost.
- Do not scrape ice or open panels to reach the sensor.
- For the service call, record E02, the unit size, and any frost you noticed.
How a technician diagnoses error code E02
- Read E02 and check for any other sensor codes.
- Inspect the coil sensor lead, its clip position on the evaporator and its connector.
- Measure sensor resistance with a meter and compare it with the coil temperature.
- Verify defrost runs normally with a good sensor in place.
- Replace the sensor only after the reading is out of range, then confirm box temperature.
- The coil sensor is behind the evaporator cover, which a technician removes with power disconnected.
- Checking the sensor against a temperature chart takes a meter.
- Frost on the coil can hide damage to the lead, so thawing and drying the area has to be done carefully.
How error code E02 differs from similar codes
E02 is the coil sensor. E01 is the air sensor on the same control.
Technical reference
- Document
- Prep Tables & Compact Refrigerators, 4400 & 4500 Series: Specifications, Installation, Operation & Maintenance Manual
- Edition
- Part Number 9295093A, 11/25 (page footers 10/25)
- Models / control
- 4400/4500 Series NP refrigerated prep tables with R290 temperature control (4424NP-4472NP, D4424NP-D4472NP, ST4424NP-ST4472NP and variants)
- Section
- Section 3 Operation, 'R290 Temperature Control & Display' table, p. 23-24
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Delfield prep table error codes
Does E02 mean the box is warming?
Not necessarily. The manual only says sensor 2, the coil sensor, is defective.
Can I scrape the frost off myself?
Do not use tools on the evaporator. Frost can hide a damaged sensor lead.
What is the difference between E01 and E02?
E01 is the air sensor and E02 is the coil sensor, per the manual's comments column.
Need help with Delfield error code E02?
A technician confirms the cause on site and gives you the price in writing before any work starts.