Expansion vessel
Jumping pressure — we recharge the vessel after you agree the estimate.
Boiler repair at home in Sergeli-5
Home visitDiagnostics with repairWarranty on labor
Boiler repair in Sergeli-5: pressure jumps or a cold return — in a panel niche we check the vessel and pump, then repair after the estimate.
On Vaillant and Ferroli in the mid-massiv the expansion vessel goes flat from riser spikes more often than the gas valve fails.
Sergeli-5: the boiler sits in a niche by the panel riser — keep the cock, gauge and flue free.
from 200,000 sum
Free diagnosticsExact price after diagnostics. We agree on the estimate and parts needed before work starts.
Arrival in 1-2 hours
Warranty included
Home repair
10+ years experience
Sergeli-5
Service Area
Visit time
Confirmed by phone
How to arrange a visit
- Clear the boiler niche by the riser of a Sergeli-5 panel block
- Share the Vaillant, Ferroli or Ariston model and the display fault code
- Note pressure jumps, a cold return or weak DHW
How the visit works
Panel circulation
Cold return — pump and air in the riser circuit.
Three-way valve
Lukewarm DHW with live heat — circuit changeover.
Exchanger & gas
Issues We Fix
Heating and DHW
- Radiators stay cold
- No hot water
- Won't hold temperature
Ignition and gas
- Won't start / no ignition
- Soot / gas smell
Pressure and leaks
- Pressure dropping
- Heat exchanger leaking
Electronics
- Display error
- Noisy operation
- Short cycling
Brands We Service
- Baxi
- Vaillant
- Ariston
- Bosch
- Ferroli
- Navien
- Buderus
- Protherm
- Immergas
- Kiturami
- Rinnai
- Fondital
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Gas boiler heat exchanger cleaning
If radiators stay lukewarm, the boiler is slow to heat, or it short-cycles — scale in the heat exchanger is a common cause. It cuts heat transfer, raises gas consumption, and can overheat the unit.
On diagnostics the technician flushes the primary and secondary exchangers, checks temperature sensors and the return filter. We agree the scope and price before cleaning starts.
Frequently Asked Questions
Boiler not heating or showing an error?
Tell us the model and fault code — we'll advise on a home visit and prepare for diagnostics.
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