Fault codes and measurement
Code reading, gas pressure, ionisation, sensor and flue measurements.
BOILER REPAIR · FAULT SERVICE
Boiler repair and fault service.Diagnose first, then repair.
Same-day fault service for boilers showing a fault code, not igniting, giving no hot water or constantly losing pressure. Root cause found by measurement, genuine parts, written guarantee; the price is stated clearly before any work starts.
HOW WE REPAIR
We don't swap parts to see what happens: the fault is measured, found and fixed once.
Most boiler faults fall into a few groups: ignition and flame, water pressure and leaks, hot water, electronics and sensors, fan and flue. Proper diagnosis means measuring which group is responsible — otherwise "let's try a new board" leaves you with an unnecessary part and an unsolved fault. Forty-five years as authorised service comes down to this: we know the appliance, we measure, we repair once.
Common faults and their causes
- No ignition / flame loss (F.28, F.29, E01, E10…) — electrode gap and wear, ionisation, gas valve, gas pressure, sometimes just a dirty burner
- Pressure keeps dropping (F.22, E02) — expansion vessel charge, weeping safety valve, hidden system leak; topping up is not a fix and speeds up scaling
- No or fluctuating hot water — scaled plate exchanger, flow sensor, diverter valve, NTC sensor
- Radiators not heating — usually the system, not the boiler: pump, diverter valve or sludge (see radiator & system flushing)
- Boiler cycling on and off — overheating, scaled exchanger, low flow, thermostat settings
- Fan / flue faults (F.32, F.33…) — fan motor, air-pressure switch, blocked flue, flue seal
- Water leaking — safety valve, pump seal, cracked exchanger, condensate trap
The repair process
- We take the fault code and symptom on the phone; common parts are carried in the van
- On-site measurement — gas pressure, ionisation current, sensor resistances, flue draught
- Diagnosis and price — what is faulty, what will be done, part and labour cost: no work without your approval
- Repair, run test and gas leak check
- Service slip and written guarantee — the part's box and certificate stay with you
Genuine parts, written guarantee
Pump, fan, gas valve, exchanger, diverter valve, control board — all the brand's genuine parts. No equivalents. Parts and labour are guaranteed in writing; a repeat of the same fault within the guarantee costs nothing.
Repair or replace?
On a boiler past 15 years, with a cracked exchanger or a board and gas valve failing together, repair may not be economical. We then cost the switch to a condensing boiler alongside the repair and let you decide.
REPAIR SCOPE
From diagnosis to guarantee.
Ignition and gas valve
Electrode, ionisation, gas valve and gas line faults.
Pressure and leaks
Expansion vessel, safety valve, pump seal and system leaks.
Hot-water faults
Plate exchanger descaling, flow sensor, diverter valve, NTC.
Boards and sensors
Control board repair/replacement, sensor and thermostat faults.
Fan and flue
Fan motor, pressure switch, flue blockage and sealing.
RELATED SERVICES
Detail for your exact need.
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All boiler service services
Boiler Service
01Boiler Maintenance
Annual service: heat exchanger, burner, gas/air ratio, flue and safety checks.
02Boiler Installation & Replacement
Right capacity, flue and pipework fit; switching an old boiler to condensing.
03Emergency Boiler Service
24/7 line nights, weekends and holidays; the nearest technician is dispatched.
FAQ
About boiler repair.
Is there a diagnosis fee?
Diagnosis is done on site and the repair price quoted before work. If you decline the repair only the call-out fee applies, which is stated when you book.
Can you come the same day?
Across the eight districts most calls are reached the same day, next day at the latest in peak winter. For emergencies call the 24/7 line.
My boiler shows a fault code — what now?
Note the code, try one reset. If it returns, keep the boiler off and call us; the code helps the technician bring the right part. If you smell gas: close the valve, ventilate, call from outside.
Is the repair guaranteed?
Yes — genuine parts and labour are guaranteed in writing; the period is on the service slip.
Which brands do you repair?
All of them — DemirDöküm, Vaillant, Baymak, Protherm, E.C.A., Bosch, Buderus, Airfel, Ferroli, Viessmann and more, with especially deep experience on DemirDöküm and Vaillant.
How is the service fee set?
After diagnosis, the work and any part cost are quoted clearly before we start. Nothing is done without your approval.
Which districts do you cover?
Same-day service across Bahçelievler, Bağcılar, Bakırköy, Güngören, Zeytinburnu, Esenler, Bayrampaşa and Küçükçekmece on Istanbul's European side. Call us for neighbouring districts.
SERVICE AREAS
Same-day service on Istanbul's European side.
Our teams are based around Bahçelievler and cover eight districts; the nearest technician is dispatched to you.
BOILER SERVICE BY BRAND
OTHER SERVICES
Boiler fault? Book a service visit.
Choose your appliance and district, add the fault code — the technician arrives with the right part.