Randell Prep Table Error Code CHt: Dirty Condenser Alarm
CHt is the dirty condenser alarm on Randell 8000-290 and 9000W-290 prep tables with the Carel controller. Turn the table off, look at the front grille for lint or a blocked intake, and leave the compressor compartment closed. Call us so the coil can be cleaned the right way.
Medium: the table still cools, but performance falls and the compressor wears faster until the coil is cleaned.
- Code
- CHt
- Maker
- Randell
- Equipment
- Prep tables
- Applies to
- Carel controller (8000-290 / 9000W-290)
What does Randell error code CHt mean?
A refrigerated prep table moves heat out of the food well and releases it at the condenser, the finned coil behind the front grille. In a kitchen that coil collects grease and lint, and the airflow through it shrinks. The Carel controller watches for the resulting rise in condensing temperature and shows CHt when it gets too high. With less heat leaving the system, the table works harder and cools less, and the compressor may run nearly all the time. The alarm is meant to be an early warning, because a coil that is allowed to stay packed makes pans drift warm during a lunch rush and adds wear to the compressor. The maker's list of reasons is short: grease and lint in the coil, a condenser fan that is slow or stopped, poor airflow around the compressor compartment, or hot kitchen air feeding the condenser. Cleaning sounds simple, but on these tables the compressor compartment holds a system with a flammable refrigerant, so the cleaning is done carefully and not with a quick open-and-vacuum.
Affected models and control systems
This applies to Randell 8000-290 and 9000W-290 series prep tables with the Carel controller, such as the 8148N-290 and 9148W-290. The Danfoss controller on the same tables shows CON for a similar condition.
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
- CHt on the controller display
- The compressor running almost continuously
- Pans warming slowly during a busy service
- Warm air at the front grille
Possible causes
Listed in Randell's documentation
- Grease and lint packed into the condenser coil
- Condenser fan slow or stopped
- Poor airflow around the compressor compartment
- Hot kitchen air feeding the condenser
Other likely causes — what usually sits behind error code CHt on this control. A technician confirms which one it is before any part is replaced.
- Table pushed against a wall or fryer line so the grille cannot draw air
- Cardboard or towels stored against the front grille
- Coil last cleaned months ago in a kitchen with heavy frying
Safe checks before calling for service
- Turn the table off at the power switch and let it rest.
- Look at the front grille for lint or a blocked intake, and clear anything stored against it.
- Do not open the compressor compartment, since the system uses a flammable refrigerant.
- Check pan temperatures with a food thermometer, and note how long it has been since the grille was last cleaned.
How a technician diagnoses error code CHt
- Read the code and confirm the Carel controller version.
- Inspect the condenser coil and the air path from the grille through the compartment.
- Clean the coil using the correct method for the refrigerant in this table.
- Verify the condenser fan runs at speed and the blades are free.
- Restart and watch the condensing temperature fall and the compressor start cycling.
- Confirm pan temperatures recover to set point.
- The compressor compartment holds a flammable refrigerant system, so opening it is a trained job.
- The condenser fan and compressor are wired to line voltage, which calls for a meter and lockout.
- Proper coil cleaning removes debris without bending fins or pushing grease deeper.
How error code CHt differs from similar codes
CHt is the Carel code. On a Danfoss controller the matching condition is CON.
Technical reference
- Document
- Randell 8000-290 & 9000W-290 Series Prep Tables Operator Manual, PP MNL1803 Rev. I (12/25), Carel / Danfoss controller codes
- Edition
- PART NUMBER PP MNL1803, REV. I (12/25)
- Models / control
- Carel controller (8000-290 / 9000W-290)
- Section
- Carel Controller Codes and Danfoss Controller Codes tables, Service/Troubleshooting, printed pp. 5-6
- 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 Randell prep table error codes
Why does a dirty condenser matter?
The coil cannot shed heat, so the table cools poorly and the compressor works longer. Grease in the air makes this happen faster.
Can I vacuum the coil myself?
We would leave it to a technician because of the flammable refrigerant behind the grille.
Will CHt go away by itself?
Not while the coil stays packed. It may clear briefly after the table rests, then return.
Need help with Randell error code CHt?
A technician confirms the cause on site and gives you the price in writing before any work starts.