- Boilers
- Electric water heater
10
Ariston 10 on a Velis water heater: outlet temperature probe open or short circuited
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On an Ariston Velis electric water heater, Er 10 means broken temperature probes, open or short circuited, on the outlet side. Reset with the ON/OFF button; if Er 10 returns, call the technical service without opening the cover.
Safety first
Stop and check this first
- Ariston reserves all maintenance for qualified personnel and requires the heater to be disconnected from the mains before any work. The cover, boards, probes, heating elements and anodes carry mains voltage or sit inside the tank: do not touch them yourself.
Safe checks you can perform
- Reset with the ON/OFF button
- Water and power in the home
- Probe check by the technical service
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measuring the outlet probe and its connector
- Do not attempt this professional task: Heating test after the repair
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.
Measuring the outlet probe and its connector
What they doThe technician measures the outlet probe resistance with a multimeter and checks its connector at the control panel before replacing anything.
They must show youthe measured probe value against Ariston's specification.
In writingwhat was measured, which part was replaced and why.
Heating test after the repair
What they doAfter the work, the technician switches the heater on and checks that it heats and that Er 10 does not return.
They must show youthe display with no code and the temperature rising.
In writingthe test date and the result.
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.
Reset with the ON/OFF button
- Who:
- you.
- How:
- switch the heater off with the ON/OFF button and switch it back on, as Ariston's error table says. Do not open the cover.
- Result that matters:
- whether, after the reset, the display stops showing Er and 10 and the status light stops flashing red.
- If the code clears:
- Ariston says the heater resumes normal operation; note the date in case it comes back.
- If Er 10 returns or the light stays red and flashing:
- Ariston says to contact the technical assistance centre; do not keep resetting it.
- Evidence to keep:
- a photo of the display with the code before and after the reset, with the date.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
Water and power in the home
- Who:
- you.
- How:
- open a hot tap and a cold tap and check that water flows normally; also check whether the rest of the home has power and whether a breaker or RCD has tripped.
- Result that matters:
- Ariston asks you to rule out a temporary lack of water or electricity before calling the technical service.
- If water was off or there was a power cut:
- wait for supply to return and repeat the ON/OFF reset.
- If water and power are normal:
- the code does not come from the supply; move on to the technical service.
- Evidence to keep:
- a note of when the water or power cut happened, if there was one.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
Probe check by the technical service
- Who:
- a qualified Ariston service technician.
- How:
- with the heater disconnected from the mains, removes the control panel, checks the probe bar connectors and measures the probes with a multimeter against Ariston's specification.
- Result that matters:
- whether the outlet probe reads open, short circuited or within specification.
- If the probe reads out of specification:
- the probe bar is confirmed as the cause.
- If it reads correctly and the connector is firm:
- the probe is ruled out and the board becomes the suspect.
- Evidence to keep:
- a job sheet with the measured probe value and the reference of any part replaced.
Opening the cover and measuring the probes requires disconnecting the heater from the mains; this is technician work only.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
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
- Ariston
- Product type
- Electric water heater
Known code variants
- 10
- Ariston Velis 10
- calentador Rinnai 10
- código 10 Rinnai
- E10
- Er 10
- Error 10 Immergas
- error 10 Rinnai
- Immergas E10
- Rinnai 10
- Rinnai 10 tankless
- Rinnai code 10
- Rinnai code 10 water heater
- Rinnai error 10
- Velis error 10
- Victrix 10
- Victrix E10
What it means
In the Velis error table, Ariston links code 10 to the temperature probes on the outlet side of the tank when the control reads them as open or short circuited. With the fault, the status light turns red and flashes and the display alternates Er with the code. Code 20 is the same fault on the inlet side. The code does not tell a damaged probe bar from a loose connector or the board that reads it: only a technician's measurement separates them.
Warnings and stop conditions
- Highsource verified
Ariston reserves all maintenance for qualified personnel and requires the heater to be disconnected from the mains before any work. The cover, boards, probes, heating elements and anodes carry mains voltage or sit inside the tank: do not touch them yourself.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
Symptoms and causes
Probable causes · in order
- Outlet probe open or short circuitedCommon
This is the condition Ariston describes for code 10. If the code comes back right after every reset, the probe reading is still out of range.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
- Probe bar connectionPossible
Ariston notes that working on the probe bars means disconnecting their cables from the control panel; a poorly seated connector gives the same reading as a broken probe.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
- Board that reads the probePossible
If the probe measures correctly on the technician's meter, the fault moves to the board. Only measurement tells them apart, not the code.
Evidence: Ariston Velis, instrucciones para la instalación, el uso y el mantenimiento de calentadores eléctricos
Virtual technician
Does 10 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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