- Boilers
- Electric water heater
E1
Cointra E1 on a TND electric water heater: dry heating fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
On Cointra TND electric water heaters with a digital panel, E1 is a dry heating fault: there is no water in the tank and the temperature rises 10 °C or more in one minute. Unplug the unit, check the cold water valve and fill it as the manual describes.
Safety first
Stop and check this first
- The electrical connections, heating element and anode sit behind the protective cover; only the Technical Assistance Service or an electrician should open it, always with the unit unplugged.
- Do not leave the water heater plugged in while it shows E1: it is heating without water. Disconnect it and keep it off until the tank is full and purged of air.
- The safety valve drain pipe must discharge to open air on a continuous downward slope; never cap or bypass it while you deal with E1.
Safe checks you can perform
- Unplug the water heater first
- Check the cold water valve
- Fill and purge as at first start-up
- Reconnect and watch the panel
Leave these tasks to a qualified professional
- Do not attempt this professional task: Confirm filling and normal heating
- Do not attempt this professional task: Inspect the heating element and anode
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Confirm filling and normal heating
What they doThe service technician confirms the tank is full with no trapped air and follows the heating on the panel to see whether E1 comes back.
They must show youthe unit heating normally or the moment E1 returns.
In writingwhat was checked and the result.
Inspect the heating element and anode
What they doWith the unit disconnected and drained, they inspect the heating element, remove scale and check the magnesium anode, as the manual's annual service provides.
They must show youthe condition of the element and the anode.
In writingany parts replaced.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Unplug the water heater first
The TND connects with a Schuko type plug. Unplug it with dry hands or switch it off with the ON/OFF button so the element stops heating while you check the water. Do not open the unit's protective cover.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
Check the cold water valve
Find the shut-off valve fitted on the cold water pipe feeding the tank and make sure it is open. If someone closed it or drained the tank for a repair or a trip, that is the most likely explanation for E1.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
Fill and purge as at first start-up
With the unit unplugged, open the cold water valve and the hot taps. Once water flows from all of them, close them starting with the lowest, the bidet, and ending with the highest, the shower. This drives the air out of the tank and pipes.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
Reconnect and watch the panel
Plug the unit in and, if the display stays dark, press ON/OFF. It should show the water temperature and a flashing dot while heating. If E1 returns with the tank full, stop there and call the Technical Assistance Service.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Boilers
- Brand
- Cointra
- Product type
- Electric water heater
Known code variants
- aire acondicionado Daikin E1
- climatisation Daikin E1
- climatizzatore Daikin E1
- code erreur E1 Daikin
- codice E1 Daikin
- código E1 Daikin
- Cointra E1
- Daikin AC E1
- Daikin E1
- Daikin error E1
- Daikin Fehler E1
- Daikin Fehlercode E1
- Daitsu E1
- DDSX225 E1
- De'Longhi dehumidifier E1 probe
- De'Longhi E1
- DeLonghi Tasciugo E1
- deshumidificador De'Longhi E1 sonda
- deshumidificador Meaco E1
- DEXD216F E1
- E01
- E 1
- Er1
- error E1 Daikin
- error E1 frigorífico Hotpoint
- error E1 lavavajillas Fagor
- error E1 lavavajillas LG
- errore E1 Daikin
- Fagor 3LVF-623.1 E1
- Fagor dishwasher E1
- Fagor dishwasher error E1
- Fagor dishwasher not filling E1
- Fagor lavavajillas E1
- frigorífico combi Hotpoint E1 sensor
- Gree E1
- Haier E1
- Hotpoint E1 error fridge freezer
- Hotpoint E1 frigorífico
- Hotpoint fridge freezer E1
- Hotpoint fridge freezer E1 sensor fault
- Klimaanlage Daikin E1
- lavavajillas Fagor no coge agua E1
- lavavajillas LG aquastop E1
- lavavajillas LG fuga E1
- lavavajillas LG no coge agua E1
- LG dishwasher aquastop E1
- LG dishwasher E1
- LG dishwasher error E1
- LG dishwasher float switch E1
- LG dishwasher leak E1
- LG lavavajillas E1
- Meaco 12L E1
- Meaco dehumidifier E1
- Meaco E1
- MeacoDry Arete E1
- panne E1 Daikin
- TND 100 E1
- TND 150 E1
- TND 50 E1
- TND 80 E1
- TND E1
What it means
The manual for the Cointra TND 50, 80, 100 and 150 includes a fault table for the digital panel. In it E1 stands for dry heating failure, detected when there is no water in the tank and the temperature rises 10 °C or more within one minute. The panel signals it with an alarm on the display. The same table lists other codes separately, E3 for the temperature sensor and E4 for water overheating, so E1 points to a lack of water in the tank. If the message returns with the tank full and purged of air, the Technical Assistance Service must inspect it.
Warnings and stop conditions
- Higheditorial warning
The electrical connections, heating element and anode sit behind the protective cover; only the Technical Assistance Service or an electrician should open it, always with the unit unplugged.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
- Highsource verified
Do not leave the water heater plugged in while it shows E1: it is heating without water. Disconnect it and keep it off until the tank is full and purged of air.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
- Mediumsource verified
The safety valve drain pipe must discharge to open air on a continuous downward slope; never cap or bypass it while you deal with E1.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
Symptoms and causes
Probable causes · in order
- Empty or partly filled tankCommon
The fault table defines E1 as dry heating: no water in the tank and a temperature rise of 10 °C or more in one minute, typical when the unit is switched on after draining or without having been filled and purged.
Evidence: Cointra TND 50, 80, 100 y 150, termos eléctricos: instrucciones de instalación, uso y conservación
Virtual technician
Does E1 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
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