My boiler loses water and pressure.
Boiler needs frequent refilling · Boiler pressure drops · Boiler water leak
Note how quickly the pressure falls and where any visible leak appears. Repeated refilling does not resolve the cause. Share the brand, model and any fault code when requesting a service assessment.
Related guide ↗My boiler does not provide hot water.
Water stays cold · No hot water at the tap · Water alternates hot and cold
Explain whether all taps or only one tap is affected. Tell the service team whether the radiators work and whether the water remains cold or its temperature fluctuates.
Related guide ↗My boiler runs but the radiators stay cold.
Boiler does not heat · Cold radiators · Home stays cold
Check the heating mode and room thermostat demand. Explain whether every radiator or only some are affected. A service assessment considers both the boiler and the heating system.
Related guide ↗My boiler does not ignite or start.
Boiler will not fire · Boiler does not work · Boiler switches itself off
Note whether the display is on and record any fault code. Do not dismantle combustion or gas components. For a recurring fault, seek technical support rather than repeatedly resetting the appliance.
Related guide ↗My boiler pressure keeps rising.
High boiler pressure · Pressure rises while heating · Water beneath the boiler
Explain whether the change happens while the appliance is cold or during heating. Correct values and checks depend on the model. Follow the manual and service guidance if pressure is high or water is discharged.
Related guide ↗My boiler makes noise.
Boiler hums · Boiler rattles · Boiler vibrates
Describe whether the noise occurs at start-up or continuously, and whether it changes during hot water or heating use. A brief recording may help the service team; noise alone does not identify a failed part.
Related guide ↗My boiler displays a fault code.
Boiler error · Red warning light · Boiler requests a reset
Share the exact code, brand and model. The same code may mean different things on different appliances. Use the model manual; a confirmed diagnosis or part quote requires assessment.
Related guide ↗The bottom of my radiators stays cold.
Radiator heats unevenly · One radiator stays cold · Does the system need cleaning?
Valve settings, circulation and system condition are considered together. Cleaning is not automatically the answer to every cold radiator. Share how many are affected and the last maintenance date.
Related guide ↗My boiler heats slowly or never reaches the set temperature.
Slow heating · Boiler runs continuously · Home does not warm up
Share room temperature, thermostat setting and affected radiators. Heating time also depends on the room and heating system; it is not determined by the boiler alone.
Related guide ↗Hot water flow is weak but cold water flow is normal.
Low hot water flow · Weak hot water pressure · Weak hot shower
Explain whether one tap or all hot water outlets are affected. Tap water flow and the boiler heating pressure gauge measure different things. The tap, pipework and appliance may need assessment together.
Related guide ↗My boiler switches on and off repeatedly.
Boiler starts frequently · Boiler cycles rapidly · Frequent ignition
Note the operating mode and approximate interval. Stopping does not always indicate a fault; repeated short runs require assessment of settings and operating conditions.
Related guide ↗My boiler does not respond to the thermostat.
Thermostat will not start the boiler · Thermostat connection issue · Temperature demand ignored
Share the thermostat model and display message. Wired and wireless systems require different checks. Consult the model manual for settings without interfering with gas or electrical connections.
Related guide ↗My radiators warm up when I only want hot water.
Warm radiators in summer mode · Radiators heat during hot water use · Heating does not stop
Distinguish a powered-off boiler from summer mode. Explain whether radiators warm during hot water use. This symptom alone does not establish that a particular part needs replacement.
Related guide ↗I need boiler maintenance or a check after maintenance.
Annual boiler maintenance · Boiler issue after maintenance · Boiler maintenance cost
Share the last maintenance date, work performed and any new symptom. Ask which checks are included and whether repairs or parts are quoted separately.
Related guide ↗