- Heat pumps
- Pool heat pump
Er 13
Poolex Er 13 on pool heat pump: ambient temperature protection
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
On the Poolex Jetline Selection Fi, code 13 is the ambient temperature protection: the air is outside the working range of -7 °C to 43 °C and the unit stops. If the air is within range, the sensor may be badly placed.
Safety first
Stop and check this first
- The refrigerant circuit and the internal electrics are for a qualified technician: the user only cleans, checks valves and watches the temperature range.
- Poolex requires the power to be disconnected before any operation on the heat pump; never open panels with the unit connected, because water sits next to mains voltage.
Safe checks you can perform
- Check the air temperature around the unit
- Make sure the evaporator and air inlet are clear
- Winterise if the unit will sit idle in the cold
Leave these tasks to a qualified professional
- Do not attempt this professional task: Reposition or replace the ambient sensor
- Do not attempt this professional task: Yearly maintenance by a qualified person
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.
Reposition or replace the ambient sensor
What they doIf the code shows with air inside the range, a technician checks where the ambient sensor sits, moves it away from the exchanger or replaces it if faulty.
They must show youthe sensor position before and after and the temperature it reads against a thermometer.
In writingwhether the sensor was moved or replaced, the part reference and the warranty.
Yearly maintenance by a qualified person
What they doPoolex asks for a qualified person to carry out safety checks every year, along with wiring, earthing and the state of the gauge and refrigerant.
They must show youthe safety, wiring and earthing checks carried out.
In writingthe date, the gauge pressure recorded and any fault found.
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.
Check the air temperature around the unit
- Who:
- you, in the shade.
- How:
- measure the air temperature near the heat pump and compare it with the range in the manual, -7 °C to 43 °C. Bear in mind that in full sun, against a hot wall or in a hard frost the reading can fall outside that range.
- Result that matters:
- knowing whether code 13 really reflects air that is too cold or too hot.
- If the air is outside the range:
- wait; according to Poolex the unit stops and will resume once the temperature is back in range.
- If the air is within the range:
- note it, because it points to the position or condition of the sensor.
- Evidence to keep:
- the measured temperature, the time and a photo of the display.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Make sure the evaporator and air inlet are clear
- Who:
- you, with power disconnected.
- How:
- disconnect the heat pump's power first, as Poolex requires for any maintenance. Remove leaves or dirt from the rear with a vacuum cleaner and a soft brush, as the manual says, and clean the casing only with a damp cloth, without detergents.
- Result that matters:
- air flows freely around the unit and its sensor.
- If there was dirt built up:
- restore power and see whether the code clears with air inside the range.
- If everything was clean and the code continues in good weather:
- ask for the sensor to be checked.
- Evidence to keep:
- photos of the evaporator before and after cleaning.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Winterise if the unit will sit idle in the cold
- Who:
- you, before winter.
- How:
- if the code shows because winter is coming and you will not use the heat pump, Poolex asks for it to be winterised once air drops below 3 °C: disconnect the power, open the by-pass and close inlet and outlet, unscrew the pipes to drain it and fit its winter cover.
- Result that matters:
- no water is left inside to freeze while the unit is off.
- If you winterise it with those four steps:
- keep the plugs and cover for next season.
- If your circulating pump is controlled by the heat pump:
- drain it too, as the manual says.
- Evidence to keep:
- the winterising date and a photo of the closed valves.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
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
- Heat pumps
- Brand
- Poolex
- Product type
- Pool heat pump
Known code variants
- Er 13
- Er13
- Poolex 13
- Poolex ambient temperature protection
- Poolex E13
- Poolex error 13
- Poolex fuera de rango de temperatura
- Poolex Jetline Selection Fi 13
- Poolex outside operating temperature
- Poolex protección temperatura ambiente
What it means
The fault list in the Poolex Jetline Selection Fi manual links code 13 to ambient temperature protection. It gives two causes: the air is outside the unit's working range, in which case the unit simply stops working, or the ambient sensor is abnormal or too close to the heat exchanger surface, in which case it must be repositioned. The range Poolex publishes is -7 °C to 43 °C of air. Code 13 alone does not prove that the sensor or any other part is faulty.
Warnings and stop conditions
- Mediumeditorial warning
The refrigerant circuit and the internal electrics are for a qualified technician: the user only cleans, checks valves and watches the temperature range.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
- Highsource verified
Poolex requires the power to be disconnected before any operation on the heat pump; never open panels with the unit connected, because water sits next to mains voltage.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Symptoms and causes
Probable causes · in order
- Air outside the working rangeCommon
Poolex says the unit stops working when the ambient temperature leaves its range, which the manual sets between -7 °C and 43 °C.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
- Ambient sensor badly positionedPossible
If the sensor sits too close to the heat exchanger surface, it reads a temperature that is not the air's; the manual says to reposition it.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
- Abnormal ambient sensorLess common
The manual also allows for a sensor that works badly, which only a technician can confirm by measuring with the unit de-energised.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Virtual technician
Does Er 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
Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Poolstar (Poolex) · 2025 · official_doc
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