- Boilers
- Gas boiler
F37
Lamborghini F37 on a gas boiler: system water pressure is low
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Lamborghini F37 shows low system water pressure and the boiler stops. Read the value on the display with the circuit cold, refill with the filling knob as the manual describes and call service if it comes back.
Safety first
Stop and check this first
- If you smell gas, open doors and windows, operate no switches or flames, shut the gas cock if you can do so safely, get out and call your distributor's emergency line or 112.
- Always close the filling knob afterwards and fill only with the circuit cold, as the manual asks. Do not open the drain cock on your own.
Safe checks you can perform
- Read the pressure with the circuit cold
- Refill with the filling knob
- The technician looks for leaks and checks the transducer
Leave these tasks to a qualified professional
- Do not attempt this professional task: Leak search in the hydraulic circuit
- Do not attempt this professional task: Pressure transducer review
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 search in the hydraulic circuit
What they doA technician finds where water is being lost and restores tightness before the filling is considered done.
They must show youthe starting pressure and the leak point that was found.
In writingwhere the leak was and the final pressure after the repair.
Pressure transducer review
What they doIf the real pressure is correct and F37 persists, the technician checks the transducer connection and replaces it if damaged.
They must show youthe real pressure they measured against the one the display shows.
In writingwhether the transducer was reconnected or replaced and the final reading.
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.
Read the pressure with the circuit cold
- Who:
- you, no tools.
- How:
- Look at the pressure shown on the boiler display with the system cold: the manual says it should be around 1.0 bar and that below 0.8 bar it should be restored.
- Result that matters:
- The number on screen decides whether a refill is enough or something else is going on.
- If it shows less than 0.8 bar, go on to the refill in the next step.
- If the pressure is normal and F37 stays, do not add more water and tell the service technician about a possible transducer fault.
- Evidence to keep:
- a photo of the display with the pressure and the code.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
Refill with the filling knob
- Who:
- you, no tools, with the boiler cold.
- How:
- Pull out the filling knob and turn it counter-clockwise as the manual describes, watch the value on screen and always close it again when done.
- Result that matters:
- Once the pressure is restored, the boiler runs a 300-second air venting cycle shown on the display as Fh.
- If Fh appears and then goes out, let the cycle finish and the boiler returns to normal operation.
- If the pressure drops again within days or F37 returns, stop refilling and call an authorised technician about a possible water leak.
- Evidence to keep:
- the pressure before and after the refill and the date of each refill.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
The technician looks for leaks and checks the transducer
- Who:
- official Lamborghini service or an authorised installer.
- How:
- Looks for leaks in the hydraulic circuit and, if the real pressure is correct while F37 stays, checks the connection and condition of the pressure transducer.
- Result that matters:
- It separates a real leak from a false transducer reading before anything is replaced.
- If a leak is found, it is repaired and tightness restored before the system is filled again.
- If there is no leak and the transducer is badly connected or damaged, it is reconnected or replaced.
- Evidence to keep:
- a report with the starting pressure, the leak search result and the transducer condition.
Checking the transducer means opening the boiler: authorised staff only, with the electrical supply disconnected.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
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
- Boilers
- Brand
- Lamborghini Caloreclima
- Product type
- Gas boiler
Known code variants
- Alhena Tech C F37
- Anomalía F37 Ferroli
- caldera Lamborghini F37
- Cointra F 37
- Error F37 Cointra
- Error F37 Ferroli
- F-37
- Ferroli error F37
- Ferroli F37
- Ferroli F37 boiler
- Ferroli F37 caldera
- Ferroli F37 presión
- Ferroli F37 pressure
- Lamborghini boiler F37
- Lamborghini Caloreclima F37
- Lamborghini F37
- Lamborghini low water pressure
- Lamborghini presión de agua baja
- Superlative F37
- turboMAG F.37
- turboMAG plus F37
- Vaillant F.37
- Vaillant F37 calentador
What it means
In the Alhena Tech C faults table, F37 is listed as low system water pressure. It is a type F fault: it resets by itself once the value is back in the normal range, with no manual reset. The manual gives two possible causes, a pressure that is too low or a pressure transducer that is disconnected or damaged, so the code alone does not prove a leak or a failed part: first look at the real pressure on the display. The figures below come from the English pages of the multilingual manual.
Warnings and stop conditions
- Higheditorial warning
If you smell gas, open doors and windows, operate no switches or flames, shut the gas cock if you can do so safely, get out and call your distributor's emergency line or 112.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
- Mediumsource verified
Always close the filling knob afterwards and fill only with the circuit cold, as the manual asks. Do not open the drain cock on your own.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
Symptoms and causes
Probable causes · in order
- Pressure too low in the circuitCommon
The table gives a pressure that is too low as the first cause, corrected by filling the system as the manual describes.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
- Slow water loss in the systemPossible
If you keep having to top up, the table ties repeated top-ups to leaks in the hydraulic circuit that someone must locate.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
- Pressure transducer disconnected or damagedPossible
The table's second cause is the pressure transducer, which can be unplugged or faulty and give a false reading.
Evidence: Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
Virtual technician
Does F37 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
Lamborghini Caloreclima Alhena Tech C, manual multilingüe cod. 3541V514 (sección en español)
Lamborghini Caloreclima · 2025 · manual
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