Convotherm combi oven error codes
What common Convotherm 4 and maxx messages mean, safe checks to try first, and when to call a technician.
Error on the display and service starting soon? Call 0800 90 60 30. Calls are answered 24 hours, 7 days. Technician cover runs 7 days, with after-hours emergency cover. We aim to respond to emergencies within 2 hours, depending on workload. This is a target, not a guarantee.
CES Wellington is a Convotherm service agent. This page covers common operator messages on Convotherm 4 (easyDial and easyTouch) and on Convotherm maxx. Codes differ between those families, so use the section that matches your machine. Photograph the display and note the model from the rating plate before you switch off. See all brand pages on error codes.
The lists below are the common messages an operator sees — water supply, fans, gas, door, core probe, steam generator, temperature sensors and cleaning faults. They are not a full catalogue of every sub-code (especially internal fan-drive codes). If your code is not listed, photograph the display and call us.
Convotherm 4 (easyDial and easyTouch)
| Code | What it means | What you can safely do |
|---|---|---|
| E01.1 / E01.2 / E01.3 | Not enough water — in the steam generator (boiler), for water injection (spritzer), or in the collector box (flowmeter). E01.1.1 is boiler calcification: the upper probe detects water and the lower probe does not. | Open the water tap, and check the water connection is on. If the unit has a dirt-trap filter at the supply that you can reach without removing panels, it may be dirty. If the code remains, call us. Leave the panels on. |
| E02 | Temperature in the electrical or wiring area is too high. | Check the unit is not too close to a wall or another heat source, and that air intakes and the fan grille are not blocked or dusty. If it remains, call us. |
| E03.x | Fan error (oven fan / variable-frequency drive). Sub-codes include the fan not reaching target speed or a loss of communication with the fan drive. | Call a technician. Leave the panels on. |
| E05.x | Gas error: no gas, or a fault in the burner system (gas units only). | Check the kitchen gas shut-off valve or gas tap is open. If the code remains, call us. Leave the panels on. |
| E10 | Water treatment cartridge empty. | Replace the water-treatment cartridge if your unit has one, as the manufacturer directs. If you are unsure, call us. |
| E21.x | Oven (cooking-cabinet) sensor failure. | Call a technician. Leave the panels on. |
| E22.x | Core temperature sensor (CTC) error, including sous-vide probe variants. | You may still be able to cook without using the core probe. Call us to have the probe checked. |
| E23 / E26 | Boiler temperature sensor error, or boiler over-temperature. | Call a technician. Leave the panels on. If it is safe, switch off at the wall or isolator. |
| E24 / E25 / E30 | Bypass, collector-box or drain temperature sensor error, or drain over-temperature. | Call a technician. Leave the panels on. |
| E31.0 | The boiler and/or convection safety temperature limiter has tripped. | Call a technician. Leave the panels on. If it is safe, switch off at the wall or isolator. |
| E33.0 | Boiler heating error: no temperature increase could be measured in the boiler. | Call a technician. Leave the panels on. If it is safe, switch off at the wall or isolator. |
| E34 / E35 | Boiler pump or drain pump error. | Call a technician. Leave the panels on. |
| E58 / E59 / E60 / E61 / E62 | Cleaning-system fault (detergent, neutraliser or circulation pump, steam not reached during cleaning, or a pressure-switch error during cleaning). | Stop and do not leave cleaner in the cabinet. Call us. |
| E71.x | Door contact error (closed or venting position invalid). | Check the door is fully closed. If the code remains, call us. |
| E73.1 | Brownout: the power interruption was too long. The summary notes this can also appear the next day if the unit was shut off during cooking or cleaning. | If the supply is stable, try starting the unit again. If the code remains, call us. |
| E99.x | Communication lost between the control and the display, or an initialisation error. | Call a technician. Leave the panels on. |
Source: Convotherm 4 error-code table (C4 Error Codes) — displayed messages for OEB, OES, OGB and OGS units; and Summary of error messages, Convotherm 4 – TDS 11, part no. 9400101_00, English, October 2015. Meanings are the display messages and descriptions from those documents, not the technician repair steps.
Convotherm maxx
maxx uses the same style of E-codes. A few titles and sub-codes differ from Convotherm 4, including the low-water cleaning / flowmeter message.
| Code | What it means | What you can safely do |
|---|---|---|
| E01.2 | Not enough water for water injection for steam generation (water pressure is less than 0.5 bar 3 seconds after the valve opens). | Open the water supply. If it comes back, call us. Leave the panels on. |
| E01.4 (E01.3 in some maxx software) | Low water while washing out the cooking chamber; flowmeter error, often during cleaning. The volume of water was not reached in time. | Open the water supply. If it comes back, call us. |
| E02 | Temperature in the wiring compartment is too high. | Check air intakes and the fan grille are not blocked or dusty, and that the unit is not sitting in extra heat. If it remains, call us. |
| E03.x | Fan or variable-frequency-drive error, including the fan not reaching target speed or loss of communication. | Call a technician. Leave the panels on. |
| E05.x | Gas error (gas units): no gas, or a fault in the burner system. | Check the gas tap is open. If it remains, call us. |
| E10 | Water treatment cartridge empty, where that option is fitted. | Replace the cartridge if you have one, or call us. |
| E21.x / E22.x | Cooking-cabinet sensor failure, or core-temperature (or sous-vide) sensor error. | For a core-probe error you may still cook without the probe. Call us. |
| E31.0 | A safety temperature limiter has tripped. | Call a technician. Leave the panels on. If it is safe, switch off at the wall or isolator. |
| E33 / E34 / E35 | Boiler heating, boiler pump or drain pump error. | Call a technician. Leave the panels on. If it is safe, switch off at the wall or isolator. |
| E61 / E62 / E63 | Cleaning steam-saturation error, or a pressure-switch error (including a blocked injection nozzle leading to E63.0 in the maxx notes). | Call us. Do not leave cleaner in the cabinet. |
| E71.x | Door contact error. | Check the door is fully closed. If it remains, call us. |
| E99.x | Communication lost between the control and the display. | Call a technician. Leave the panels on. |
Source: “Error Codes Only – Convotherm Maxx”; and Convotherm maxx training handbook, 9468002_03 ENG, chapter 4, Error messages. Where the two agree, the wording above follows those descriptions. The maxx notes record that some software versions show E01.4 for a fault also referred to as E01.3.
Safe checks to try first
- Water supply: the water tap to the oven is open, and the connection is fitted.
- Door: fully closed.
- Ventilation: air intakes and the fan grille are not blocked, and the unit is not tight against a wall or another hot appliance.
- Gas units: the kitchen gas shut-off or gas tap is open for normal use; if a gas fault is showing and you have any doubt, leave it and call us.
- Cartridge: if the unit has a water-treatment cartridge and E10 is showing, it may be empty.
Leave the panels on. There are live electrical parts inside. If you see water near electrics or smell burning, switch off at the wall or isolator if it is safe to do so, and call us.
When to call a technician
- The message stays after the safe checks above.
- The code is a sensor, fan, pump, heating, safety-limiter, communication or gas fault.
- A cleaning programme has failed and cleaner may still be in the cabinet.
See combi oven repairs for breakdown and maintenance cover.
FAQ
What does E01 mean on a Convotherm 4 or maxx?
E01 is a not-enough-water fault — in the steam generator, for steam injection, or at the flowmeter / collector. Open the water tap and check the supply. If it remains, call 0800 90 60 30.
What does E03 mean on a Convotherm?
E03 is a fan error, including the oven fan not reaching speed or a drive communication fault. Call a technician and leave the panels on.
What does E05 mean on a gas Convotherm?
E05 is a gas error: no gas, or a fault in the burner system. Check the kitchen gas shut-off or gas tap is open. If it remains, call 0800 90 60 30.
What does E22 mean on a Convotherm?
E22 is a core temperature sensor (CTC) error. You may still be able to cook without the probe. Call us to have it checked.
What does E31 mean on a Convotherm?
E31 means a boiler and/or convection safety temperature limiter has tripped. Switch off if it is safe, leave the panels on, and call 0800 90 60 30.
Are Convotherm 4 and maxx codes the same?
Many titles are the same, but they are not identical. For example, some maxx software uses E01.4 for a low-water cleaning / flowmeter fault that C4 lists as E01.3. Use the section that matches your machine and send us a photo of the display.
Error still showing?
Call 0800 90 60 30 or book a job. The line is answered 24 hours, 7 days. Extra or out-of-hours charges may apply.