- Boilers
- Tankless gas water heater
E6
Rheem E6 on gas water heater: water overtemperature lockout
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Error code E6 on the digital display of a Rheem forced-draft gas water heater means overtemperature protection tripped because water exceeded 85 °C. Close the hot water tap, let the unit cool, lower the set temperature and, if E6 persists, contact the brand's authorized technical service.
Safety first
Stop and check this first
- After pausing hot water use or seeing code E6 (above 85 °C), keep skin away from the initial stream: let hot water run for a few seconds first to avoid severe burns.
- Never bypass or tamper with the overheating safety device or flue gas sensor; all internal repairs belong to the brand's authorized technical service.
Safe checks you can perform
- Close the hot tap, avoid skin contact with 85 °C water and let it cool
- Lower the set temperature on the display to 50 °C or below
- Confirm the cold water inlet valve and hot water tap open fully
Leave these tasks to a qualified professional
- Do not attempt this professional task: Cleaning the flowswitch water filter and descaling the heat exchanger
- Do not attempt this professional task: Inspection of the 85 °C overheat safety device, sensor and controller
- Do not attempt this professional task: Gas working pressure check by a licensed gas installer
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.
Cleaning the flowswitch water filter and descaling the heat exchanger
What they doThe technician closes the cold-water valve, cleans the clogged inlet filter inside the flowswitch, fits new gaskets and removes lime scale from the finned combustion chamber ducts.
They must show youthe cleaned flowswitch filter, restored hot water flow and leak-free new gaskets.
In writingthe filter cleaning and heat exchanger descaling work completed.
Inspection of the 85 °C overheat safety device, sensor and controller
What they doRheem's official technical service inspects the 85 °C overheating safety cut-out, the temperature sensor, the fan post-purge cycle and the main electronic controller.
They must show youwater temperature holding steady on the display without overshooting when the tap opens and closes.
In writingthe sensor, cut-out or controller checked or replaced with original parts and the verified shutoff temperature.
Gas working pressure check by a licensed gas installer
What they doWhen water overheats even at a low temperature setting, a licensed gas installer measures working gas pressure and checks the internal gas pressure stabilizer and solenoid valves.
They must show youthe manometer reading regulated to 1.8 kPa (180 mmH2O) for natural gas.
In writingthe recorded gas pressure and the licensed installer's name and registration number.
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.
Close the hot tap, avoid skin contact with 85 °C water and let it cool
- Who:
- you, at the faucet and control panel.
- How:
- close the hot water tap right away to prevent scalding from water above 85 °C and allow the forced-draft fan to finish its post-purge cooling cycle before touching the controls.
- Result that matters:
- water inside the heat exchanger cooling down safely without burn hazard.
- If steam comes out or you notice an abnormal smell or gas odor:
- close the gas shutoff valve, ventilate and leave the heater off.
- If the unit cools down without strange smells or noises:
- check the temperature setting and water flow.
- Evidence to keep:
- a photo of Display E6 and a note on whether it appeared during steady flow or right after a brief pause.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
Lower the set temperature on the display to 50 °C or below
- Who:
- you, using the control panel buttons.
- How:
- press the Decrease button to lower the target temperature to a moderate level within the normal 50 °C open-tap range (if it had been raised up to 65 °C with the tap closed, outlet water runs much hotter).
- Result that matters:
- a lower target temperature shown on the digital display.
- If it was set near 65 °C or choked with cold-water mixing:
- once cool, test with the hot tap opened fully.
- If it was already set to a moderate temperature and E6 returns:
- stop using the unit and arrange service.
- Evidence to keep:
- the temperature setting shown before and after your adjustment.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
Confirm the cold water inlet valve and hot water tap open fully
- Who:
- you, at the plumbing valves.
- How:
- make sure the cold-water shutoff valve on the right inlet is 100% open and open the hot water tap to maximum flow, letting water run for a few seconds before touching it as the manual advises.
- Result that matters:
- steady, full water flow that carries heat away from the heat exchanger.
- If water flow is weak across the home:
- check household water pressure (the heater operates between 20 kPa and 800 kPa).
- If flow is weak only at the heater or E6 reappears immediately:
- switch the heater off and contact authorized service.
- Evidence to keep:
- observation of the hot tap flow rate and whether E6 returns at full flow.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
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
- Rheem
- Product type
- Tankless gas water heater
Known code variants
- Bongo D series communication failure
- Bongo D30 E6
- Bongo E6
- Bongo scooter error E6
- Bongo serie D fallo de comunicación
- Brother FS60x E6
- Cecotec Bongo controller display error
- Cecotec Bongo error controlador pantalla
- Cecotec scooter error E6
- Code E6
- Código E6
- Display E6
- E6
- E6 message on the LCD
- Error E6
- error E6 calefón Rheem
- error E6 calentador Rheem
- Main motor disconnected or engine failure
- Main motor overload
- Mensaje E6 en la pantalla LCD
- Motor bloqueado por hilo enredado
- Motor locked by tangled thread
- Motor principal desconectado o fallo del motor
- patinete Bongo error E6
- patinete Cecotec error E6
- Rheem E6
- Rheem gas water heater E6
- Rheem overtemperature E6
- Rheem R7-14L E6
- Sobrecarga en el motor principal
- sobretemperatura E6 Rheem
What it means
In Rheem's installation, use and maintenance manual for the R7-14L-GN-XI-TF-B forced-draft gas water heater (along with R7-14L-GN-XI-TF and R7-14L-GN-XI-TF-G), Display E6 signals overtemperature protection triggered when water temperature exceeds 85 °C, and the manual's remedy is to contact technical service. Other Rheem models may differ, and code E6 alone never proves that a part is defective. All work involving gas supply, flue venting, flame or ignition components, thermal cut-outs and electrical parts must be carried out exclusively by the brand's authorized service technician.
Warnings and stop conditions
- Highsource verified
After pausing hot water use or seeing code E6 (above 85 °C), keep skin away from the initial stream: let hot water run for a few seconds first to avoid severe burns.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
- Highsource verified
Never bypass or tamper with the overheating safety device or flue gas sensor; all internal repairs belong to the brand's authorized technical service.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
Symptoms and causes
Probable causes · in order
- Set temperature configured too high or improper mixing at the tapCommon
With the tap open the setpoint reaches 50 °C (and with the tap closed it can be raised up to 65 °C in 5 °C steps); the manual notes that a high setting or poor mixing makes outlet water overly hot.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
- Low water flow from a clogged inlet filter, half-open tap or low pressureCommon
Rheem's common faults chart explains that a blocked water filter, a tap not opened fully or low household water pressure reduces flow through the heat exchanger and overheats the water.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
- Excessively high gas supply pressure or scale buildup in water passagesPossible
The troubleshooting table links overly hot water even at a low temperature setting to abnormally high gas pressure in the installation, as well as lime scale inside the water ducts.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
- Malfunction of the water control device, post-purge fan or main controllerLess common
The heater uses fan post-purging to prevent excessive water temperature rise when the burner shuts off; a fault in the flow control device, fan or main controller triggers the 85 °C trip.
Evidence: Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
Virtual technician
Does E6 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
Manual de Instalacion Uso y Mantenimiento Calefon sin llama piloto Tiro Forzado R7-14L-GN-XI-TF-B
Rheem · 2026 · official_doc
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