Heat exchanger
We flush the Navien or Protherm exchanger when radiators stay lukewarm with a live flame.
Boiler repair at home in C-1
Home visitDiagnostics with repairWarranty on labor
Boiler repair in C-1: no ignition, falling pressure, or cold radiators — the technician checks the exchanger, pump, and board.
On Navien and Protherm we inspect the condensate trap and return mesh first, then ignition electrodes.
In C-1 panel kitchens clear the wall-hung boiler and the coaxial flue toward the courtyard.
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
C-1 (Chilanzar)
Service Area
Visit time
Confirmed by phone
How to arrange a visit
- Share the Bosch, Navien, or Protherm model and the display fault code
- Write cold radiators, no DHW, or a falling needle — and the display code if it shows
- Clear access to the gas cock and flue in the C-1 panel kitchen
How the visit works
Ignition and gas
We test spark, electrodes, and the Bosch gas valve on failed ignition or a gas smell.
Pump and pressure
We check the pump and expansion vessel when pressure falls or the circuit hums in a panel flat.
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
Topic 1 / 3
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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