Jackson Glasswasher Error Code F10: Wash Tank Not Heating
F10 on a Jackson Delta HT-E-SEER glasswasher means the wash tank is not heating as expected. The manual points to the temperature input, probe T1, the high-limit switch, the wash heater or the contactor. A technician has to test each.
High: the wash tank is not heating, so the machine cannot clean as intended.
- Code
- F10
- Maker
- Jackson
- Equipment
- Glasswashers
- Applies to
- Delta HT-E-SEER glasswasher dishmachines
What does Jackson error code F10 mean?
F10 is the wash tank version of the booster heating code F5. The control calls for heat, the wash water does not warm, and the screen reads "F10 Service needed" with "Check wash tank thermostat and high limit". The manual lists five causes: a failed temperature input (T1) on the I/O module, a failed probe T1, a failed high-limit switch, a failed wash heater, and a wash heater contactor that is not energizing. The manual's method starts by putting a 1.8 kOhm resistor in place of T1 and seeing whether the heater turns on, which tells the technician whether the problem lies in sensing or in heating. A cool wash can leave glasses with film and lipstick or oil still on them, which is what a bar usually notices first. The remaining steps are measurements of the probe, the heater and the contactor coil voltage.
Affected models and control systems
Jackson Delta HT-E-SEER glasswasher dishmachines. The error table is on printed pp. 25-27 of the Delta HT-E-SEER manual.
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
- Display reads F10 Service needed, Check wash tank thermostat and high limit
- Wash water that stays lukewarm
- Glasses still greasy or filmy after a cycle
Possible causes
Listed in Jackson's documentation
- Temperature input (T1) on the I/O module failed
- Probe T1 failed
- High-limit switch failed
- Wash heater failed
- Wash heater contactor not energizing
Other likely causes — what usually sits behind error code F10 on this control. A technician confirms which one it is before any part is replaced.
- A high-limit switch that opened after an overheat and has stayed open
- A heating element heavily scaled in a hard-water area
- A contactor whose coil is weak and does not pull in
Safe checks before calling for service
- Turn the glasswasher off and let it rest for several minutes.
- Run a cycle and see whether F10 returns.
- Do not search for a reset inside the machine; the manual lists none.
- Tell the technician whether glasses came out greasy and whether earlier codes appeared.
How a technician diagnoses error code F10
- Confirm F10 and measure the wash tank temperature.
- Substitute a 1.8 kOhm resistor for T1 and verify the wash heater turns on; otherwise replace the I/O module.
- Verify T1 resistance against the manual table.
- Replace the high-limit switch if open; check wash heater resistance and replace if incorrect.
- Verify contactor coil drive voltage during a call for heat and replace the contactor if voltage is present, otherwise check wiring.
- All tests are made on heater and contactor circuits with the supply connected.
- Interpreting the readings needs the manual's tables and a meter.
- A tripped limit points to an earlier overheat that needs finding, not bypassing.
How error code F10 differs from similar codes
F10 is the wash tank that will not heat. F5 is the same for the booster. F7 is the opposite on the wash side.
Technical reference
- Document
- Delta HT-E-SEER Installation, Operation, and Service Manual
- Edition
- 07610-004-54-86-E (Rev E)
- Models / control
- Delta HT-E-SEER glasswasher dishmachines
- Section
- Fault Codes / Troubleshooting, printed pp. 25-27 (PDF pp. 32-35)
- 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 Jackson glasswasher error codes
Is F10 the same as F5?
They share the same five causes in structure. F10 refers to the wash tank and probe T1, F5 to the booster and probe T3.
Why would glasses look greasy?
A wash that never warms cleans poorly, though the manual only says the tank is not heating as expected.
Is the 1.8 kOhm test something I can do?
No. It is a technician's test on the control's wiring.
Need help with Jackson error code F10?
A technician confirms the cause on site and gives you the price in writing before any work starts.