- HVAC
- Air conditioner
E6
Mitsubishi Electric E6 on an air conditioner: indoor and outdoor communication fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On Mr. Slim PKA wall units, E6 means the indoor unit does not receive a proper signal from the outdoor unit. Turn off the circuit, wait and restore power; if E6 returns, call a technician to check the connecting cable.
Safety first
Stop and check this first
- Mitsubishi Electric requires all supply circuits to be disconnected before reaching the terminals. If refrigerant leaks, ventilate the room: in contact with a flame it releases toxic gases. Board, wiring and refrigerant circuit are technician work.
Safe checks you can perform
- Power cycle
- Recent works or interventions
- Checking the connecting cable
Leave these tasks to a qualified professional
- Do not attempt this professional task: Check the wiring before replacing boards
- Do not attempt this professional task: 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.
Check the wiring before replacing boards
What they doThe technician checks continuity, tightness and wire order on the connecting cable before replacing any board.
They must show youphotos of the terminals and the cable check result.
In writingwhat was corrected or which board was replaced and why.
Test after the repair
What they doThe technician restores power and runs the unit for more than 6 minutes to check that E6 does not return.
They must show youthe unit running after that time.
In writingtest date and 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.
Power cycle
- Who:
- you.
- How:
- switch the unit off, turn off its circuit at the consumer unit, wait a few minutes and restore power.
- Result that matters:
- whether E6 reappears in the first minutes after start-up.
- If it does not return:
- it may have been a one-off signal fault; note date and time.
- If it returns:
- Mitsubishi says to check wiring and boards; call a technician.
- Evidence to keep:
- a photo of the remote with E6 and a note of when it appears.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
Recent works or interventions
- Who:
- you.
- How:
- think whether there were building works, electrical changes or work on the outdoor unit before the fault.
- Result that matters:
- whether E6 started after something near the cable between units was touched.
- If it matches an intervention:
- it points to the connecting cable; tell the technician.
- If nothing happened:
- the technician must measure the cable and boards.
- Evidence to keep:
- dates of nearby works or repairs.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
Checking the connecting cable
- Who:
- an air conditioning technician.
- How:
- with power isolated, checks the cable between units for breaks, loose terminals and wire order.
- Result that matters:
- whether the wiring is loose, crossed or shorted.
- If a wiring fault is found:
- it is corrected and confirmed as the cause.
- If the wiring is sound and E6 returns:
- it points to one of the boards.
- Evidence to keep:
- a job sheet with the wiring condition and photos of the terminals.
Requires isolating power and opening the terminal blocks on both units: technician only.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
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
- HVAC
- Brand
- Mitsubishi Electric
- Product type
- Air conditioner
Known code variants
- AEG E6
- AEG E641
- AEG hob E6
- aire acondicionado Daikin E6
- climatisation Daikin E6
- climatizzatore Daikin E6
- code erreur E6 Daikin
- codice E6 Daikin
- código E6 Daikin
- Daikin AC E6
- Daikin E6
- Daikin error E6
- Daikin Fehler E6
- Daikin Fehlercode E6
- E06
- E 6
- E641
- Electrolux hob error message E6 E641
- error E6 Daikin
- error E6 lavavajillas Smeg
- error E6 secadora Haier
- errore E6 Daikin
- Gree E6
- Haier dryer E6
- Haier dryer filters clogged E6
- Haier HD90-A636 E6
- Haier heat pump dryer E6
- Haier secadora E6
- Haier tumble dryer error E6
- Klimaanlage Daikin E6
- lavavajillas Smeg no desagua E6
- mensaje de error E6 E641 encimera Electrolux
- Mitsubishi E6
- Mr. Slim E6
- panne E6 Daikin
- Philips AMF870 E6
- Philips AMF872 E6
- Philips purifier fan heater E6 overheating
- PKA E6
- placa vitrocerámica AEG E6
- purificador ventilador calefactor Philips E6 sobrecalentamiento
- secadora bomba de calor Haier E6
- secadora Haier filtros obstruidos E6
- Smeg dishwasher E6
- Smeg dishwasher error E6
- Smeg dishwasher not draining E6
- Smeg lavavajillas E6
- Smeg LVFABCR3 E6
What it means
Mitsubishi Electric defines E6 as an indoor and outdoor communication error on the receiving side. The indoor board flags it when it gets no normal signal for 6 minutes after power-on, or for 3 minutes while running. Both units stop and the lamp blinks three times. The maker cites a loose, shorted or miswired connecting cable, electrical noise on that cable, or a damaged transmit or receive circuit on either board. The code does not say which board or whether it is the cable.
Warnings and stop conditions
- Highsource verified
Mitsubishi Electric requires all supply circuits to be disconnected before reaching the terminals. If refrigerant leaks, ventilate the room: in contact with a flame it releases toxic gases. Board, wiring and refrigerant circuit are technician work.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
Symptoms and causes
Probable causes · in order
- Loose or miswired connecting cableCommon
Poor contact, short circuit or reversed wiring between indoor and outdoor units. It is the first thing the technician checks and is usually visible at the terminals.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
- Electrical noise on the connecting cablePossible
Mitsubishi cites interference on the cable; it is suspected when wiring is sound and the fault is intermittent.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
- Transmit or receive circuit on a boardPossible
If the cable is fine and E6 returns after a power cycle, Mitsubishi says to replace the indoor or the outdoor board.
Evidence: Mitsubishi Electric split-system heat pump service manual OCH639, indoor units PKA-A24KA7, PKA-A30KA7, PKA-A36KA7
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
Mitsubishi Electric · 2016 · manual
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