- Heat pumps
- Pool heat pump
EE04
AstralPool EE04 on pool heat pump: water overheating protection
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On the AstralPool APH3 Inverboost, EE04 is the water overheating protection in heating mode: outlet water is 7 °C or more above the setpoint. Check filtration, air in the pipework and the setpoint first.
Safety first
Stop and check this first
- Water and electricity share this heat pump: AstralPool requires power to be cut before the cabinet is opened, and the electrical installation is a job for a professional electrician.
- The R32 refrigerant circuit may only be handled by a qualified technician licensed for this gas, as the manual itself states.
Safe checks you can perform
- Compare the setpoint with the water temperature
- Check filter pump, filter and air in the pipework
- Switch off and isolate the heat pump if it repeats
Leave these tasks to a qualified professional
- Do not attempt this professional task: Water flow switch test
- Do not attempt this professional task: Outlet sensor d2-TH5 check
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.
Water flow switch test
What they doThe technician checks whether the water flow switch works or sticks, with power cut before the unit is opened.
They must show youhow the flow switch responds when filtration starts and stops.
In writingthe state of the switch, whether it was replaced and the part reference.
Outlet sensor d2-TH5 check
What they doIf flow and the switch are fine, the technician measures the outlet sensor and replaces it only if it gives abnormal readings.
They must show youthe temperature the sensor reads compared with a real measurement of the outlet water.
In writingthe measured value, whether the sensor was changed and the warranty on the work.
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.
Compare the setpoint with the water temperature
- Who:
- you, at the controller.
- How:
- look at the setpoint and the water temperature shown on the controller. The manual explains that EE04 appears when outlet water is 7 °C or more above the setpoint, and one of its solutions is to change the set temperature.
- Result that matters:
- ruling out a setpoint far below the real water temperature as the trigger.
- If the setpoint was well below the water:
- set a sensible value and watch whether the code returns.
- If the setpoint is fine:
- check the filtration flow.
- Evidence to keep:
- a photo of the controller showing setpoint and water temperature.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
Check filter pump, filter and air in the pipework
- Who:
- you, pump on.
- How:
- confirm the filter pump runs and the filter is clean. Look at the pump strainer basket and the pool return: constant bubbles or a half-empty basket mean air is getting in. AstralPool asks you to watch the water supply to avoid air entering and low flow.
- Result that matters:
- water reaches the heat pump without air and with enough flow.
- If you find a dirty filter, a full basket or air:
- clean it, prime as your filter pump manual says and test again.
- If everything looks right and EE04 continues:
- leave the unit off and ask for service.
- Evidence to keep:
- the filter pressure before and after cleaning and whether there were bubbles at the return.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
Switch off and isolate the heat pump if it repeats
- Who:
- you, at the breaker.
- How:
- if EE04 returns with good flow, turn the heat pump off at the controller and switch off its circuit breaker. Do not open the cabinet: the manual says to always cut the power before reaching inside, and the flow switch and sensor are for a technician.
- Result that matters:
- the unit stays safe until the technician visits.
- If the filtration can run on its own:
- keep its usual schedule.
- If the filtration depends on the heat pump:
- ask the installer how to keep it running meanwhile.
- Evidence to keep:
- how many times EE04 showed and in what conditions.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
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
- AstralPool
- Product type
- Pool heat pump
Known code variants
- APH3 Inverboost EE04
- AstralPool EE04
- AstralPool Heat EE04
- AstralPool heat pump outlet temperature too high
- AstralPool sobrecalentamiento agua
- AstralPool water overheating protection
- bomba de calor AstralPool protección temperatura salida
- E04
- EE 04
- EE04
What it means
The APH3 Inverboost manual defines EE04 as overheating protection for the water measured by the outlet sensor d2-TH5 in heating mode. It triggers when outlet water exceeds the setpoint by 7 °C or more; the manual's example is 36 °C outlet with a 29 °C setpoint. The reasons listed are low water flow, a stuck water flow switch, an abnormal d2-TH5 sensor or that temperature gap itself. EE04 on its own does not prove that the sensor or any other part is faulty.
Warnings and stop conditions
- Highsource verified
Water and electricity share this heat pump: AstralPool requires power to be cut before the cabinet is opened, and the electrical installation is a job for a professional electrician.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
- Mediumsource verified
The R32 refrigerant circuit may only be handled by a qualified technician licensed for this gas, as the manual itself states.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
Symptoms and causes
Probable causes · in order
- Low water flowCommon
This is the first reason in the table: with little water passing through the exchanger, outlet water overheats compared with the setpoint.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
- Air or a blockage in the waterwayCommon
AstralPool asks you to check the filtration pump and waterway for air or a jam inside, and reminds you to clean the filter regularly.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
- Water flow switch stuckPossible
If the water flow switch sticks, the unit may keep heating even though the water supply has actually stopped.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
- Abnormal d2-TH5 outlet sensorLess common
An outlet sensor that reads wrongly also causes EE04; the manual says to check or replace it, which is a job for a technician.
Evidence: AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
Virtual technician
Does EE04 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
AstralPool APH3 Inverboost (R32) swimming pool heat pump: user and service manual
Fluidra (AstralPool) · 2021 · official_doc
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