HVAC fault diagnosis and repair in Terrassa
On-site diagnosis and repair of HVAC faults in Terrassa, from summer heat-related shutdowns to electrical faults in industrial units and older installations.
When HVAC fails in a Terrassa building, it often does so at the worst moment: a July afternoon with a full office, or in an industrial unit where the heat affects both staff and stock. This service is for maintenance managers and property managers in the town who need to know what failed and why, not just to get the unit running again. MRS Climatización diagnoses and repairs HVAC faults with or without a maintenance contract, working from its production and warehouse base in neighbouring Sabadell.
Faults linked to inland heat
Summers in Terrassa are hotter than on the coast, and a large share of faults appear exactly when equipment is working at its limit:
- High-pressure trips on outdoor units with dirty coils, in full sun or boxed in between walls and parapets.
- Units that run but cannot reach the set point during the hottest part of the day.
- Compressors that stop on thermal protection after several starts in quick succession.
- Condensate drains that overflow with the moisture collected during the hours of highest load.
In winter, on cold mornings, heat pumps show a different kind of fault: defrost cycles that do not finish properly, or sensors giving false readings.
Older installations in converted buildings
In former textile mills and factory buildings adapted for offices or public facilities, HVAC is usually the result of several refurbishments. That makes diagnosis harder: units from different brands communicating with one another, very long refrigerant runs and indoor units hidden in suspended ceilings with no access panels. So when reporting the fault, it helps to say how the roof and indoor units are reached, whether drawings exist and which company carried out the last refurbishment.
When the fault starts in the power supply
On the town's industrial estates, HVAC often shares a panel and supply with machinery. Starting a large motor can cause a voltage drop that stops the compressor and, seen from the unit, looks like a fault of its own. Because MRS also works on electrical installations and panels, the technician measures voltages, power draw and the condition of protective devices and contactors before replacing any part of the unit.
How the call-out is organised
- Incidents from contract clients are prioritised according to what has been agreed and the criticality of the equipment.
- Diagnosis is carried out on site with measuring equipment: pressures, temperatures, power draw, sensors and communications.
- Wherever possible, the repair is completed during the same visit.
- If a spare part is needed, it is planned from Sabadell according to the equipment and availability, and you are told the options in the meantime.
Office hours are Monday to Friday, 9:00 to 18:30, and night or out-of-hours work can be arranged in advance. The general method is described on the HVAC fault diagnosis and repair page.
From repair to prevention
If a fault returns with every heatwave, the sensible step is to review the preventive plan before summer or add the unit to an HVAC maintenance contract in Terrassa. And when repair no longer makes sense, replacement is best treated as a small installation project, with a unit sized for how the space is used today.
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Frequently asked questions
Our unit trips on high pressure on summer afternoons; what usually causes it?
In the inland heat, the condenser has to reject more heat using warmer air. If the coil is dirty, the fan loses speed, the unit sits in direct sun or recirculates its own hot discharge air, pressure rises until the safety cut-out trips. The diagnosis measures pressures and temperatures to separate these causes from refrigerant overcharge or a unit that is simply undersized.
Do you take on one-off repairs in Terrassa without a maintenance contract?
Yes. MRS takes on one-off repairs for clients without a contract. The unit's make and model, alarm codes and a description of the fault are used to prepare the visit. The repair is assessed after the on-site diagnosis, once the cause is known and it is clear whether spare parts are needed.
Can the repair be done while the industrial unit or shop is closed?
Night or out-of-hours work can be arranged in advance, for example when the repair means isolating a panel that shares circuits with production, or in a shop that cannot close during the day. This is not an emergency service: the time slot is agreed with the building manager.
The refrigerant pipework runs right through a former industrial building; how do you find a leak?
First, a refrigerant shortage is confirmed by measurement. Then the most likely points are checked: joints, valves, unit connections and sections exposed to vibration or to the weather on the roof. On long, hard-to-reach runs, we discuss with the manager whether to repair that section or renew it, depending on its overall condition.
What should we do if the same fault comes back every summer?
It is a sign that the cause has not been resolved or that the unit is working at its limit. Every intervention is recorded, which makes the pattern visible and helps decide whether pre-summer maintenance needs revising, the outdoor unit would be better relocated, or the equipment needs resizing for how the space is used today.
Report a fault in your Terrassa building
Tell us the unit, the alarm codes, whether the fault appears in hot weather and how the outdoor unit is reached so we can prepare the visit.
Report a fault