Heat exchanger
We flush and judge the Vaillant secondary if domestic hot water is barely warm.
Boiler repair at home in Chilanzar-12
Home visitDiagnostics with repairWarranty on labor
Boiler repair in Chilanzar-12: no domestic hot water or short cycling — the technician checks the heat exchanger, diverter valve and expansion vessel.
On Vaillant in quarter 12 five-storey niches the secondary exchanger scales up: radiators are hot, the tap is barely warm.
The coaxial flue often exits the end wall onto the through-yard — give the floor and passage side so we can judge Bosch flue access.
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
Chilanzar-12
Service Area
Visit time
Confirmed by phone
How to arrange a visit
- Chilanzar-12: five- or nine-storey, floor and a boiler niche by the riser.
- Leave access to the gas cock, return and the expansion-vessel valve.
- Name Vaillant or Bosch: no hot water, short cycling, or jumping pressure.
How the visit works
Diverter
We check changeover between heat and water when the boiler only serves one circuit.
Expansion vessel
We measure Bosch nitrogen pre-charge if pressure jumps on every cycle.
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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