- HVAC
- Air conditioner
13
Hisense 13 on air conditioner: compressor overheat protector
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Fault code 13 on a Hisense air conditioner means the compressor overheat protector device has tripped. Hisense lists loose overload protector wiring, a faulty protector, insufficient refrigerant, long piping without extra charge, or expansion valve failure: switch the unit off and call service.
Safety first
Stop and check this first
- Hisense warns that all power supply circuits must be disconnected before obtaining access to terminals, and refrigerant must never be discharged directly into the air.
- Do not repeatedly restart a unit showing code 13: Hisense requires waiting at least 3 minutes after operation stops, and persistent compressor overheating requires professional service.
Safe checks you can perform
- Display fault code 13 by pressing SLEEP 4 times on the remote
- Check that outdoor unit air inlets and outlets are unobstructed
- Inspect overload protector wiring, welding points and refrigerant charge
Leave these tasks to a qualified professional
- Do not attempt this professional task: Reconnect or replace the compressor overload protector
- Do not attempt this professional task: Check welding points for leaks and adjust refrigerant for pipe length
- Do not attempt this professional task: Inspect the expansion valve and outdoor control board
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.
Reconnect or replace the compressor overload protector
What they doThe technician checks the wiring of the compressor overload protector, secures any loose connection, and replaces the overload protector if it has failed.
They must show youthe reconnected overload protector lead or the replaced overload protector component.
In writingfault code 13, test results on the overload protector and its wiring, and the service date.
Check welding points for leaks and adjust refrigerant for pipe length
What they doThe technician inspects the unit's welding points to confirm whether there is a leak, recharges the refrigerant, or adds the required extra refrigerant if the installation pipe is longer than normal.
They must show youthe inspected welding points and the refrigerant weight charged into the circuit.
In writingleak check results on welding points, installation pipe length, and refrigerant amount added.
Inspect the expansion valve and outdoor control board
What they doIf the protector and refrigerant charge are normal, the technician tests the expansion valve and the outdoor control board and replaces whichever component has failed.
They must show youthe replaced expansion valve or outdoor control board (if faulty) and the 7-segment outdoor display clear of code 13.
In writingfindings on the expansion valve and outdoor control board, any part replaced, and confirmation of normal operation.
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.
Display fault code 13 by pressing SLEEP 4 times on the remote
- Who:
- you.
- How:
- press the SLEEP button on the wireless remote controller 4 times in a row: Hisense's service manual notes that the fault code displays on the LCD for 10 seconds and then disappears automatically.
- Result that matters:
- confirming whether code 13 is the active fault stored by the air conditioner.
- If code 13 appears during the 10-second window:
- note it down and turn the air conditioner off so the compressor can cool.
- If a different fault number is displayed:
- record that exact number to give to the technician.
- Evidence to keep:
- a photo or note of code 13 retrieved on the display after pressing SLEEP 4 times.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA
Check that outdoor unit air inlets and outlets are unobstructed
- Who:
- you, looking from outside without removing any covers.
- How:
- make sure nothing is placed in front of the air inlet or outlet of the outdoor unit and verify that outdoor air temperature is within the operating range stated in the user manual.
- Result that matters:
- ruling out blocked outdoor airflow as an external heat load on the unit.
- If obstacles were blocking the outdoor vents:
- remove them, wait at least 3 minutes as required by Hisense before restarting once.
- If the outdoor vents are clear and code 13 returns:
- switch off the appliance and disconnect its power supply.
- Evidence to keep:
- photos of the clear space around the outdoor unit and note of the 3-minute wait.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA · Hisense manual de uso e instalacion aire acondicionado split CA25YR03
Inspect overload protector wiring, welding points and refrigerant charge
- Who:
- qualified HVAC technician.
- How:
- disconnect all power supply circuits before accessing terminals, then inspect the compressor overload protector wiring, check welding points for refrigerant leaks, and verify pipe length charge and expansion valve operation.
- Result that matters:
- pinpointing whether code 13 is caused by the protector wiring/sensor or by low refrigerant flow.
- If the overload protector wire is loose or the protector is faulty:
- reconnect the wire or replace the overload protector.
- If a welding point leaks or extra pipe length lacks refrigerant:
- repair any leak, recharge refrigerant and check the expansion valve.
- Evidence to keep:
- service report covering overload protector continuity, leak inspection at welding points, and refrigerant charge.
All supply circuits must be disconnected before accessing terminals, and R32 refrigerant must never be discharged directly into the air.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA · Hisense manual de uso e instalacion aire acondicionado split CA25YR03
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
- Hisense
- Product type
- Air conditioner
Known code variants
- 13
- código 13 aire Hisense
- E13
- error 13 Hisense
- Hisense 13
- Hisense AC code 13
- Hisense error 13
What it means
In Hisense's DC-Inverter air conditioner service manual, outdoor fault code 13 indicates that the compressor overheat protector device has operated. It displays on the indoor panel, wired controller, outdoor board 7-segment display, or for 10 seconds on the remote LCD after pressing SLEEP 4 times. Hisense lists six possible causes: loose overload protector wiring, failed overload protector, insufficient refrigerant, installation piping longer than normal without extra refrigerant added, failed expansion valve, or outdoor control board failure. Fault code 13 alone never proves that the compressor or any specific part has failed.
Warnings and stop conditions
- Highsource verified
Hisense warns that all power supply circuits must be disconnected before obtaining access to terminals, and refrigerant must never be discharged directly into the air.
Evidence: Hisense manual de uso e instalacion aire acondicionado split CA25YR03
- Mediumsource verified
Do not repeatedly restart a unit showing code 13: Hisense requires waiting at least 3 minutes after operation stops, and persistent compressor overheating requires professional service.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA · Hisense manual de uso e instalacion aire acondicionado split CA25YR03
Symptoms and causes
Probable causes · in order
- Loose wiring or failure of the compressor overload protectorCommon
Hisense's outdoor fault table lists a loosely connected overload protector wire or a failed overload protector as the first two reasons for fault code 13.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA
- Insufficient refrigerant or long pipe run without extra chargeCommon
Hisense points to low refrigerant from a leak at a welding point, or an installation pipe longer than standard where no additional refrigerant was added.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA
- Expansion valve failure in the refrigeration circuitPossible
A faulty expansion valve restricts refrigerant flow to the compressor and causes the overheat protector device to trip with code 13.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA
- Outdoor control board failureLess common
Hisense lists an abnormal outdoor control board as the final possible cause when the protector circuit and refrigerant system check out.
Evidence: Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA
Virtual technician
Does 13 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
Hisense DC-Inverter Air Conditioners Technical and Service Manual V1.0 AUF-48UR6RTMPA
Hisense España · 2020 · official_doc
- 2
Hisense manual de uso e instalacion aire acondicionado split CA25YR03
Hisense España · 2021 · official_doc
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