Primary exchanger
Weak Baxi heat is checked as scale before quoting a flush.
Boiler repair at home in Darkhan
Home visitDiagnostics with repairWarranty on labor
A boiler in Darkhan that leaves radiators cold, has no DHW, or dumps pressure — exchanger checks by the Botanical Garden.
A Baxi primary exchanger in Darkhan cakes with scale — we flush the circuit before any replacement call.
We reach Darkhan niches from east Mirzo-Ulugbek, landmark the Botanical Garden.
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
Darkhan
Service Area
Visit time
Confirmed by phone
How to arrange a visit
- Name Baxi, Vaillant, or Navien and the fault: cold radiators, no DHW, a display code
- Darkhan is a Mirzo-Ulugbek residential estate by the Botanical Garden; for a boiler name the floor and which facade faces the garden
- Clear access to the gas cock and gauge — we meet at the Darkhan courtyard
How the visit works
Pressure sensor
A falling Vaillant needle points to the sensor and expansion vessel.
Control board
A Navien code is read and relays rung before a module swap.
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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