- Boilers
- Electric water heater
LED 5
Calorex LED 5 on Lévittas electric water heater: overheat
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
When all control panel LEDs blink at once on a Calorex Lévittas electric storage water heater and holding ON/OFF for 5 seconds makes LED 5 (Ref. 5) flash, a sensor detected excessive water temperature. If steam comes from the taps, switch off the 30 A breaker immediately and call authorized service.
Safety first
Stop and check this first
- If water is boiling and steam comes out of the taps, switch off electrical power to the appliance immediately and contact the authorized service center; never try to repair the unit yourself.
- Never power on the electric storage heater unless it is completely full of water, never block the relief valve outlet and never remove electrical covers or use extension cords.
Safe checks you can perform
- If steam comes out of the taps or water leaks, switch off the 30 A breaker
- Hold ON/OFF for 5 seconds to read which LEDs (1 to 5) blink
- Verify a full tank of water and lower the temperature setting once cool
Leave these tasks to a qualified professional
- Do not attempt this professional task: Checking the 0.68 MPa pressure relief valve and 30 A grounded circuit
- Do not attempt this professional task: Testing NTC sensors 1 to 4, safety relays, manual reset and PCB
- Do not attempt this professional task: Descaling the 1500 W heating element and inspecting the magnesium 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.
Checking the 0.68 MPa pressure relief valve and 30 A grounded circuit
What they doThe specialist verifies that the relief valve in a closed system (0.68 MPa / 7 kgf/cm2 / 100 psi) or air vent in an open system is unobstructed and checks the No. 12 THW wiring, copperweld ground and 30 A breaker.
They must show youthe relief valve discharging freely to an open drain and a verified yellow-green ground connection.
In writingthe water system pressure, relief valve check and electrical circuit compliance.
Testing NTC sensors 1 to 4, safety relays, manual reset and PCB
What they doCalorex's authorized technician follows the 127 V wiring diagram to inspect sensors NTC 1 through NTC 4, the manual reset thermal cut-out, safety relays 1 and 2 and the CPU electronic card.
They must show youdiagnostic mode clear of fault blinks and accurate temperature control between 40 °C and 80 °C.
In writingthe diagnostic LED code found (Ref. 5, Ref. 4 and 5 or Ref. 3, 4 and 5) and any factory parts replaced.
Descaling the 1500 W heating element and inspecting the magnesium anode
What they doWith power disconnected and the tank drained, the technician removes the 1500 W resistance to clean lime scale without damaging the element shell and checks or replaces the magnesium anode.
They must show youthe descaled heating element, the magnesium anode condition and the tank refilled and purged of air before powering on.
In writingthe maintenance performed on heating elements R1 and R2, anode replacement and leak check.
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.
If steam comes out of the taps or water leaks, switch off the 30 A breaker
- Who:
- you, at the home electrical panel.
- How:
- check whether steam comes out of the hot water taps or water is dripping near electrical parts. As instructed in the manual's Important Notes, if the water is boiling switch off the appliance's electrical power at the 30 A thermo-magnetic circuit breaker right away.
- Result that matters:
- the water heater safely disconnected from 127 V power without touching internal covers or wiring.
- If steam came out of a tap or water reached electrical parts:
- leave the breaker off and contact the brand's authorized service.
- If there is no steam or leaking water around connections:
- proceed to read the diagnostic LED pattern.
- Evidence to keep:
- a note on whether steam appeared and the condition of the relief valve calibrated to 0.68 MPa (7 kgf/cm2 or 100 psi).
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65 · Codigos de error de calentadores de agua: que hacer cuando aparecen
Hold ON/OFF for 5 seconds to read which LEDs (1 to 5) blink
- Who:
- you, at the Calorex Lévittas control panel.
- How:
- while all panel LEDs blink in standby, press and hold the ON/OFF button (Ref. A) for 5 seconds to enter diagnostic mode and note which LEDs from Ref. 1 (bottom) to Ref. 5 (top, Fig. 6) flash; press ON/OFF or wait 25 seconds to exit.
- Result that matters:
- knowing whether LED 5 blinks alone or together with LED 2, LED 3 or LED 4.
- If LEDs 3, 4 and 5 (or 2, 3, 4 and 5) blink together:
- switch off the unit because it indicates excessive heating from lack of water.
- If only LED 5 (or 4 and 5) blinks:
- write down the exact pattern before checking water purging and temperature settings.
- Evidence to keep:
- a short video or note of the exact blinking LEDs during the 25-second diagnostic window.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65
Verify a full tank of water and lower the temperature setting once cool
- Who:
- you, at the cold-water inlet valve and shower hot tap.
- How:
- once the tank cools, make sure the cold-water supply valve is open and slowly open the hot shower tap until water flows continuously with no air pockets; if the alert happened once, lower the target temperature with the '-' key toward a moderate level (between 40 °C and 70 °C).
- Result that matters:
- the tank completely full of water and set to a normal comfort temperature.
- If the alert clears after a single reset with steady water flow:
- monitor that the standby blink does not return.
- If all LEDs start blinking again:
- do not repeat resets and contact the brand's authorized technical service.
- Evidence to keep:
- model (Lévittas 45 L or 65 L), serial number, LED combination and whether shower hot water flowed steadily.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65 · Codigos de error de calentadores de agua: que hacer cuando aparecen
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
- Calorex
- Product type
- Electric water heater
Known code variants
- all control panel LEDs blink Calorex
- Calorex LED 5
- Calorex Lévittas LED 5 blinking
- Calorex Lévittas overheat LED 5
- exceso de temperatura Calorex Lévittas
- LED 5
- parpadeo LED 5 Calorex Lévittas
- Ref. 5
- todos los LEDs parpadean Calorex
What it means
In Calorex's installation and operation manual for the Lévittas 45 and 65 electric storage water heater (and Calorex's error code guide), when a fault occurs the unit enters standby with all panel LEDs blinking; holding ON/OFF (Ref. A) for 5 seconds opens diagnostic mode where a blinking LED 5 (Ref. 5) indicates excessive water temperature in the hot water outlet tank (or with LEDs 2, 3 and 4, overheating from lack of water or a damaged PCB). Other models may differ, and the alert alone never proves a part is faulty. All work on elements, sensors, thermal cut-outs, valves and 127 V~, 1500 W electrics is for the authorized technician.
Warnings and stop conditions
- Highsource verified
If water is boiling and steam comes out of the taps, switch off electrical power to the appliance immediately and contact the authorized service center; never try to repair the unit yourself.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65
- Highsource verified
Never power on the electric storage heater unless it is completely full of water, never block the relief valve outlet and never remove electrical covers or use extension cords.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65 · Codigos de error de calentadores de agua: que hacer cuando aparecen
Symptoms and causes
Probable causes · in order
- Excessive water temperature detected in the outlet tank (LED 5 or LEDs 2 and 5)Common
Calorex's diagnostic chart assigns blinking Ref. 5 to excessive water temperature detected by a sensor in the hot water outlet tank, and Ref. 2 and 5 to the cold-water inlet tank.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65
- Dry heating caused by lack of water in the tank (LEDs 3, 4 and 5)Possible
When LEDs 3, 4 and 5 (or 2, 3, 4 and 5) flash together in diagnostic mode, the manual identifies excessive heating caused by lack of water in the outlet or inlet tank.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65
- Temperature set to the 80 °C maximum with low flow or lime scale on the elementPossible
Calorex's error guide notes that an overly high temperature setting (Lévittas adjusts from 40 °C to 80 °C, with 70 °C default) or lime crust on the heating element promotes overheat alerts.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65 · Codigos de error de calentadores de agua: que hacer cuando aparecen
- General excess temperature from a damaged electronic card (LEDs 4 and 5)Less common
If diagnostic mode flashes Ref. 4 and 5 (or Ref. 2, 4 and 5), the Lévittas manual attributes the lockout to general excess temperature caused by a damaged electronic card.
Evidence: Instructivo de Instalacion Mantenimiento y Operacion Calentador Electrico de Deposito Calorex Levittas 45 y 65
Virtual technician
Does LED 5 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
- 1
Calorex · 2019 · official_doc
- 2
Codigos de error de calentadores de agua: que hacer cuando aparecen
Calorex · 2026 · official_doc
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