- Heat pumps
- Pool heat pump
ER06
Poolex Er 06 on pool heat pump: low pressure protection
Risk level
High
Professional inspection is recommended.
Urgency
Medium
Quick answer
On the Poolex Jetline Selection Fi, code 06 means the refrigerant low pressure protection has tripped. Look at the gauge with the unit off and note the reading; do not try to top up the gas.
Safety first
Stop and check this first
- This heat pump contains R32, a flammable refrigerant. Poolex forbids any work on the refrigerant circuit without authorisation: only an F-gas certified technician, with a leak detector suitable for R32 and no flame or spark nearby.
- Poolex requires the power supply to be disconnected before any work or maintenance on the heat pump. Do not open the casing: water and mains voltage are together inside.
Safe checks you can perform
- Gauge with the unit off
- Visible signs around the unit
- Status values and fault history
Leave these tasks to a qualified professional
- Do not attempt this professional task: Leak detection and pressure measurement
- Do not attempt this professional task: Low pressure switch and 4-way valve test
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.
Leak detection and pressure measurement
What they doAn F-gas certified technician measures the pressures with service gauges and looks for the leak with a detector suitable for flammable refrigerants such as R32.
They must show youthe measured pressures and the leak point found.
In writingwhere the leak was, how it was repaired, the R32 charge added and the leak test.
Low pressure switch and 4-way valve test
What they doIf the charge is correct, the technician checks the low pressure switch connection and that it cuts the circuit when tripped, and the 4-way valve switching.
They must show youthe result of each test.
In writingthe part replaced, its reference and the reason.
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.
Gauge with the unit off
- Who:
- you, looking at the gauge without opening or touching anything.
- How:
- with the heat pump off for a good while, note the pressure. Poolex says that at rest it shows a value matching the ambient temperature (between 150 and 350 PSI maximum) and that before starting after a long idle period it must read at least 80 PSI.
- Result that matters:
- whether the rest pressure is low or well below 80 PSI.
- If it reads below 80 PSI:
- do not start it; a leak is likely and you need a refrigeration technician.
- If it reads a normal value for the outdoor temperature:
- a leak is less likely; tell the technician.
- Evidence to keep:
- a photo of the gauge with time and outdoor temperature.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Visible signs around the unit
- Who:
- you, from outside without opening the casing.
- How:
- look for oil stains or corrosion on the visible pipes and joints; Poolex asks for this to be checked during servicing.
- Result that matters:
- spotting a possible leak point without touching the circuit.
- If you see oil stains:
- photograph them and show the technician.
- If you see nothing:
- it does not rule out a leak; a detector confirms it.
- Evidence to keep:
- photos of the areas checked.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Status values and fault history
- Who:
- you, from the heat pump controller.
- How:
- enter status check mode by holding for 3 seconds the button shown in section 5.9 of the manual; step through the parameters and note the 4-way valve state (SfF) and codes HE1 to HE4 (fault history).
- Result that matters:
- knowing whether the code repeats in the history and which values the unit showed.
- If the history shows the same code several times:
- it is not a one off; show it to the technician.
- If it is the first time and it clears once the water is corrected:
- watch it for a few days before calling.
- Evidence to keep:
- a photo of each value on the screen, with the date.
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
- bomba de calor Zodiac baja presión
- E06
- Er 06
- Poolex 06
- Poolex E06
- Poolex error 06
- Poolex Jetline Selection Fi 06
- Poolex low pressure protection
- Poolex protección baja presión
- Zodiac Er06
- Zodiac heat pump low pressure
- Zodiac low pressure protection
- Zodiac protección baja presión
- Zodiac Z250 Er06
What it means
The low pressure switch watches the refrigerant pressure on the low side of the circuit. Poolex gives three causes for 06 on the Jetline Selection Fi: insufficient refrigerant, a defective 4-way valve or a disconnected or defective low pressure switch. The manual adds that if pressure drops too far, the unit shows an error and goes into safe mode, which means a leak and calls for a qualified technician. The code does not say which cause it is: a normal gauge reading points to the switch more than to a leak.
Warnings and stop conditions
- Highsource verified
This heat pump contains R32, a flammable refrigerant. Poolex forbids any work on the refrigerant circuit without authorisation: only an F-gas certified technician, with a leak detector suitable for R32 and no flame or spark nearby.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
- Highsource verified
Poolex requires the power supply to be disconnected before any work or maintenance on the heat pump. Do not open the casing: water and mains voltage are together inside.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Symptoms and causes
Probable causes · in order
- Refrigerant loss from a leakCommon
The gauge reads low with the unit off. Poolex links this to a refrigerant leak that a qualified technician must find and repair.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
- Defective 4-way valvePossible
The charge is correct but the valve does not switch properly and suction pressure drops while running. Poolex says to replace it.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
- Low pressure switch disconnected or defectivePossible
The alarm shows with the gauge at normal values. Poolex says to reconnect or replace the pressure switch.
Evidence: Poolex Jetline Selection Fi: installation and user manual (multilingual, 08-2025)
Virtual technician
Does ER06 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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