- Heat pumps
- Air-to-water heat pump
H90
Panasonic H90 on an Aquarea heat pump: unit communication fault
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
On an Aquarea, H90 means communication errors between the indoor and outdoor units. Panasonic asks you to reset the error and make sure all isolators are switched on; if the code continues, call your installer.
Safety first
Stop and check this first
- If a breaker trips again straight after you reset it, do not keep trying: there may be an electrical fault that a professional needs to find.
- Do not open the covers of the indoor or outdoor unit to check cables: Panasonic reserves servicing of the units for qualified personnel.
Safe checks you can perform
- Check the isolators for both units
- Check the household consumer unit
- Reset the error from the controller
Leave these tasks to a qualified professional
- Do not attempt this professional task: Check of the communication cable between units
- Do not attempt this professional task: Diagnosis of the communication boards
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 of the communication cable between units
What they doWith the installation isolated, the installer checks the cable connections between the indoor and outdoor units and confirms the cable is not damaged or wrongly connected.
They must show youthe connections checked and any damaged section of cable.
In writingwhich connection or section failed and how it was fixed.
Diagnosis of the communication boards
What they doIf the wiring is sound, the technician checks the indoor and outdoor boards with Panasonic's service manual before replacing any.
They must show youthe power and communication measurements on both units.
In writingthe diagnosis, any board replaced, its reference and the final test.
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 isolators for both units
- Who:
- you, without opening any covers.
- How:
- find the local isolators or switches for the indoor and outdoor units and check they are all in the on position. Panasonic states this explicitly for H90.
- Result that matters:
- both units powered.
- If one was off:
- switch it on and reset the error from the controller.
- If they were all on:
- check the household consumer unit.
- Evidence to keep:
- photo of the isolator positions.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
Check the household consumer unit
- Who:
- you.
- How:
- open the consumer unit door and see whether the breaker or RCD feeding the heat pump has tripped. Panasonic's guide includes this check when the outdoor unit does not work.
- Result that matters:
- knowing whether a breaker has cut the supply.
- If a breaker had tripped:
- switch it back on once only; if it drops again, leave it down and ask the installer for help.
- If nothing had tripped:
- move on to resetting the error.
- Evidence to keep:
- photo of the consumer unit with the switches visible.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
Reset the error from the controller
- Who:
- you, using the Aquarea control panel.
- How:
- with the isolators and consumer unit in order, reset the error as your system's user guide describes and watch whether the unit starts normally or H90 comes back.
- Result that matters:
- knowing whether the alert was a one-off or persists.
- If the system starts and H90 does not return:
- keep the reset date in case the alert reappears.
- If H90 returns after the reset:
- contact your installer quoting the code, as Panasonic asks.
- Evidence to keep:
- note of the reset time and whether the code came back.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
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
- Panasonic
- Product type
- Air-to-water heat pump
Known code variants
- Aquarea comunicación unidad interior exterior H90
- Aquarea H90
- Aquarea indoor outdoor communication H90
- bomba de calor Panasonic H90
- error H90 aerotermia Panasonic
- H90
- Panasonic Aquarea H90
- Panasonic heat pump error H90
- Panasonic heat pump H90
What it means
Panasonic's Aquarea user guide for the C, D and E series lists H90 as communication errors between the indoor and outdoor unit. The advice to the user is to reset the error, make sure all isolators are switched on and contact the installer quoting the code. An isolator or breaker that is off leaves one unit without power and the other stops hearing it. If everything has power, the fault may be in the wiring or a board, and the code is not enough to tell which.
Warnings and stop conditions
- Loweditorial warning
If a breaker trips again straight after you reset it, do not keep trying: there may be an electrical fault that a professional needs to find.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
- Highsource verified
Do not open the covers of the indoor or outdoor unit to check cables: Panasonic reserves servicing of the units for qualified personnel.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
Symptoms and causes
Probable causes · in order
- Isolator or switch for one unit turned offCommon
Panasonic asks you to check that all isolators are on: if one unit loses power, the other loses communication with it.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
- Tripped breaker in the consumer unitPossible
The guide includes checking whether the household breaker has tripped when the outdoor unit does not work, which also cuts communication.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
- Faulty communication wiring or electronicsPossible
If both units have power and H90 remains after the reset, the guide refers you to the installer to check the cable between units and the boards.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
Virtual technician
Does H90 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
Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series
Panasonic · 2014 · manual
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