- Heat pumps
- Air-to-water heat pump
H62
Panasonic H62 on an Aquarea heat pump: water flow cut-out
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On Aquarea units, H62 means the flow sensor detects water flow too low in the primary circuit. Panasonic says to clean the in-line filter, remove air and reset; if it happens 4 or more times in 24 hours, call the installer.
Safety first
Stop and check this first
- Panasonic states that service must be carried out by qualified personnel only and that you must not put fingers into the unit, as rotating parts may cause injury. When a code shows, turn the unit off and give the code to an authorised dealer.
Safe checks you can perform
- How often the code repeats
- In-line filter, air and reset
- Flow against the minimum and head loss
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measure primary flow
- Do not attempt this professional task: Hydraulic separation only if the pump is not enough
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.
Measure primary flow
What they doThe installer reads actual flow and compares it with Panasonic's H62 minimum and the model's rated flow.
They must show youthe flow in l/min against 7 or 11 l/min for your unit.
In writingthe cause found, filter, air, valve or pump, and what was done.
Hydraulic separation only if the pump is not enough
What they doIf flow stays short with a clean filter, vented system and open valves, the installer considers the hydraulic separation Panasonic proposes.
They must show youthe flow measured with the circuit clean and open.
In writingthe calculation or measurement that justifies hydraulic separation.
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.
How often the code repeats
- Who:
- you.
- How:
- note each time H62 appears with date and time.
- Result that matters:
- Panasonic sets the limit at 4 or more times in 24 hours before calling the installer.
- If it appears once:
- follow the user guide steps and watch.
- If it reaches 4 or more times in 24 hours:
- stop resetting; call the installer with the code.
- Evidence to keep:
- a list of dates and times.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series · Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
In-line filter, air and reset
- Who:
- you only if the installer showed you how to close the valves and clean the in-line filter; otherwise the installer.
- How:
- clean the in-line filter, remove air from the pipework and reset the system, as Panasonic's user guide says.
- Result that matters:
- whether H62 clears after cleaning and resetting.
- If it clears:
- the filter or air was the likely cause; note what you found.
- If it returns:
- the simple causes are ruled out; pump versus head loss or a valve remain.
- Evidence to keep:
- a photo of the filter before and after.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series · Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
Flow against the minimum and head loss
- Who:
- the installer.
- How:
- they check all valves are open, vent the system, clean the Y strainer and measure primary flow; if it stays low, they work out whether the pump can overcome the head loss.
- Result that matters:
- measured flow against 7 l/min with one fan or 11 l/min with two, and against your model's rated flow.
- If flow rises above the minimum after venting or cleaning:
- a hydraulic cause is confirmed.
- If it stays low with everything open and clean:
- the pump cannot handle the system; Panasonic points to hydraulic separation.
- Evidence to keep:
- a job sheet with the flow in l/min.
Opening the unit and working on the pressurised circuit is qualified installer work.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series · Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
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 H62
- Panasonic Aquarea H62
- Panasonic heat pump H62
What it means
Panasonic defines H62 as a water-side flow rate cut-out. In the H and J monobloc installation guide it explains that the flow sensor detects a problem with the primary flow, usually because it is too low: below 7 l/min on single fan units and 11 l/min on twin fan units, H62 occurs. The maker's flowchart separates three causes: a pump that cannot overcome head loss, a blocked Y strainer, and an air lock or closed valve. The code does not say which.
Warnings and stop conditions
- Mediumsource verified
Panasonic states that service must be carried out by qualified personnel only and that you must not put fingers into the unit, as rotating parts may cause injury. When a code shows, turn the unit off and give the code to an authorised dealer.
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
- Blocked Y strainer or in-line filterCommon
It is the first check in both the user guide and the installer flowchart. It often shows after installation or after months without cleaning.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series · Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
- Air lock or closed valveCommon
An air pocket or a closed valve cuts flow with a clean filter. Panasonic says to vent the system and open all valves.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series · Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
- Pump cannot overcome head lossPossible
If the system has more head loss than the pump can overcome, flow stays short even with everything open. Panasonic proposes hydraulic separation.
Evidence: Panasonic Aquarea user guide for Bi-Bloc, Monobloc and All in One, C, D and E series · Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
Virtual technician
Does H62 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
- 2
Panasonic Aquarea installation guide 1.2, Monobloc solutions H and J generation
Panasonic · 2021 · manual
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