Flow error
Strainer, pressure, air, pump.
Home › Heat pump › Brussels › Repair
Heat Pump Repair in Brussels: No Heating, No Hot Water or an Error Code
In short: no heating, no hot water, a code on the screen or an outdoor unit covered in ice? We repair air-to-water and air-to-air heat pumps of all makes across the Brussels Region. The call-out cost is given before we come. Call 0477 03 88 98.
A heat pump is repaired by measuring, not by swapping circuit boards to see what happens. Water flow, refrigerant pressures, sensors and the link between the indoor and outdoor units: the technician works through them in order and explains what he found before repairing.
5,0on Google· 22 years of experience
Evenings and weekendsFor a breakdown
Measure firstNo board changed to see
All makesAltherma, aroTHERM, Ecodan
Cost firstBefore the repair
Flow errors and the water circuit
It is the number one winter fault: the machine stops and shows a flow error. Many Brussels heat pumps were connected to old cast iron radiators. Sludge from the old circuit ends up in the strainer and the plate exchanger, and the flow collapses as soon as demand rises.
The technician cleans the strainer, bleeds the air, brings the circuit back up to pressure and checks the circulating pump. If the exchanger is fouled, he proposes a flush of the circuit, with the cost given first.
Before we arrive, look at the pressure gauge: if it is very low, tell us on the phone. We guide you, and the electric back-up heater can often take over while you wait.
An outdoor unit caught by frost
In winter the outdoor unit frosts up and defrosts by itself: that is normal. What is not normal is a layer of ice that no longer clears, a frozen condensate drain or a fan that is blocked. The machine can no longer draw heat from the air and the house cools down.
In Brussels a frequent cause is the position: a narrow inner courtyard or a corner against a garden wall, where the cold air blown out is drawn straight back in. The unit then frosts far faster.
We check the sensor, the heater cable in the tray, the reversing valve and the board. If the problem comes from the position, we propose a lasting, priced solution: a deflector, a move or a raised stand, now or in the spring.
Electronics, sensors, compressor and refrigerant
A drifting temperature sensor, a control board, lost communication between the indoor and outdoor units, a breaker that trips when the compressor starts: these faults need precise measurements. Each make has its own codes, and the same symptom can have several causes.
The technician first reads the fault history and the operating values: flow and return temperatures, flow rate, pressures and the hours of the back-up heater. Measuring avoids replacing the wrong part.
If the fault involves the refrigerant, such as a leak, an expansion valve or the compressor, we find the leak before any top-up. If a part has to come from the manufacturer, we give you an honest delay and leave the house heated by the back-up.
Air-to-air heat pumps in flats
In flats in Ixelles, Etterbeek or Saint-Gilles, the air-to-air heat pump, in other words reversible air conditioning, is often the main heating. When it blows cold in heating mode or stops with a blinking light, the flat cools quickly.
Common causes are blocked filters, an outdoor unit that is iced or dirty, a sensor, a board, or a lack of refrigerant after a leak. The technician measures and repairs, with the cost given beforehand.
If the outdoor unit sits on a shared roof, simply let the syndic or the caretaker know so we can get access.
Before we arrive
Note the code shown, the make and the model: Daikin Altherma, Vaillant aroTHERM, Mitsubishi Ecodan, Panasonic Aquarea, LG Therma V, Viessmann Vitocal and others. A photo of the screen on WhatsApp is ideal.
Reset once or twice, not more. A machine that keeps going back into fault has to be checked, and repeated restarts can make some faults worse.
Clear the outdoor unit of snow, leaves or a cover that blocks the air, without hitting the ice: the fins are fragile.
After the repair
The machine runs long enough to show that it holds the set temperature before the technician leaves. He explains what happened and how to avoid it: a strainer to clean, a pressure to watch, a unit to keep clear.
If the cause is a design fault, such as a unit placed where it recycles its own cold air, we say so and give you a price to correct it.
You keep the job sheet. It is useful if the manufacturer has to step in later, and it helps at the next yearly service.
Faults we see most
Ice that stays
Defrost or position.
Lukewarm water
Sensor, valve or setting.
Lost communication
Cable, power or board.
When you call
The code
Photo of the screen.
Make and model
On the label.
The pressure
Figure on the gauge.
The moment
Heating, hot water or defrost.
How a visit works
You call or book
Describe the problem; a photo of the unit or of the code on the display, sent on WhatsApp, helps the technician prepare.
Call-out cost first
The office tells you what the visit costs and when the technician will come, before anyone sets off.
Your agreement first
On site, the technician explains what he found and what the repair costs, then waits for your yes. Job sheet and invoice at the end.
What our customers say
Where we work
We repair heat pumps in houses, flats and buildings in all 19 municipalities of the Brussels Region.
City of BrusselsIxellesSchaerbeekAnderlechtMolenbeekUccleForestSaint-GillesEtterbeekWoluwe-Saint-LambertWoluwe-Saint-PierreAuderghemJetteEvereWatermael-BoitsfortLaeken
Frequently asked questions
My heat pump shows a flow error: what should I do?
Check the water pressure and call us. It is often a clogged strainer, air in the circuit or low pressure: a fault that is usually fixed quickly.
Can I heat the house while waiting for the technician?
Often yes, thanks to the electric back-up heater. We explain on the phone how to switch it on for your model.
Why is my outdoor unit covered in ice?
A defrost that no longer works, a frozen drain, a faulty sensor or a position where the cold air goes round in circles.
Do you repair makes you did not install?
Yes, all the usual makes: Daikin, Vaillant, Mitsubishi Electric, Panasonic, LG, Viessmann, Atlantic and others.
Do you come on Sundays?
Yes. Any supplement is given before the technician sets off.
How do I know the cost of the repair?
The call-out and the first hour are given before we come. The repair is priced on site, before it is done.
How do I book?
Call 0477 03 88 98, send us a WhatsApp message or book online with the « Book an appointment » button. Tell us the municipality and, in a few words, what is going on.
Heat pump down?
Call 0477 03 88 98: we give you the arrival time and the call-out cost straight away.