A little know-how.
A more comfortable home.

1. Look at the boiler display without removing any panels. Note whether it is blank, showing a temperature or displaying a fault code.
2. Check the heating schedule, clock and holiday mode. Select a temporary heating boost and set the room thermostat above the current room temperature.
3. Check thermostat batteries and make sure the radiator valves in the rooms you want to heat are open.
4. If your system has a pressure gauge, compare its cold reading with the user manual. Use the low-pressure guide if it is below the recommended range.
5. Try a hot tap and note whether hot water works. Tell us whether every radiator is cold or only some of them.

When to stop. Book a repair if these checks do not restore heating. Do not remove the boiler case or operate internal components.

1. Check more than one hot tap. If only one tap or shower is affected, the problem may be local to that fitting.
2. For a combi, run one hot tap and observe the boiler display. Record any code and whether the boiler responds.
3. For a hot-water cylinder, check the hot-water programme and holiday setting. Use the normal boost control and allow the usual heating time.
4. Note whether central heating still works. Check system pressure if the boiler has a gauge.

When to stop. If the water remains cold, arrange a repair. Do not remove immersion-heater covers, adjust cylinder safety valves or change wiring.

1. Let the heating cool and read the gauge. Check the exact cold-pressure target in the boiler’s user manual.
2. Identify the filling device from the manual or matching official video. External loops, keyed links and keyless links operate differently.
3. Only follow the manufacturer’s homeowner filling procedure if the device is accessible and you are confident it is the correct one.
4. Watch the gauge continuously. Stop at the stated target and fully close or release the filling controls as instructed.
5. Complete any key or hose removal only as directed by the manual. Record further pressure loss rather than repeatedly topping up.

When to stop. Stop if you cannot identify the valves, water leaks, the gauge does not respond or the filling control will not close.

Worcester Bosch: boiler pressure ↗

1. Record the cold pressure, date and how often you have had to top up.
2. Look for visible damp patches around radiators, exposed pipe joints and underneath the boiler. Do not remove covers or lift floors.
3. Tell us if an outside discharge pipe is dripping and whether pressure rises substantially as the heating warms up.
4. Photograph any visible leak and the gauge if safe. Send the history with your repair request.

When to stop. Arrange an investigation if pressure repeatedly falls. Adding fresh water is not a long-term repair.

1. Turn heating off using the normal controls and let it cool. Compare the cold reading with the manual’s recommended range.
2. If you have just topped up, check that the identified filling controls are fully closed. Do not force them.
3. Note whether pressure rises with heating off or only while heating, and whether an outside pipe is discharging.

When to stop. If pressure remains too high, approaches the gauge’s red zone or water keeps entering, stop using the boiler and call us. Do not operate the pressure-relief valve or open a drain point.

1. Photograph the whole display, including alternating numbers or symbols.
2. Find the exact model using your paperwork or an externally visible label. Do not remove the case.
3. Use that model’s user manual or official support page. Similar-looking codes can mean different things on different models.
4. If the manual permits a homeowner reset, and there is no gas smell, CO alarm, leak or electrical concern, try one reset using that procedure.

When to stop. If the fault returns or the boiler will not restart, stop resetting it and arrange a repair. A code is a clue, not a confirmed diagnosis.

Worcester Bosch: official how-to videos ↗

1. Use the manual or official guide to positively identify the external plastic condensate pipe. Do not disconnect it.
2. Only attempt thawing from ground level with safe access and footing.
3. Use warm water or a warm hot-water bottle on the frozen section. Never use boiling water or a naked flame.
4. Keep water away from electrics and avoid creating an icy path. Do not climb to reach the pipe.
5. Once thawed, follow the model’s homeowner reset instructions. If it still fails, arrange help.

When to stop. Stop if the pipe is unidentified, damaged or out of safe reach. Repeated freezing needs a permanent installation improvement.

Worcester Bosch: frozen condensate ↗

1. Stop using the boiler. Keep clear of water near electrical parts, sockets or switches.
2. Only switch off at the normal electrical isolator if it is dry and you can reach it safely. Do not touch wet equipment.
3. Contain drips only if safe and without touching the appliance. Note where the water appears and whether it is continuous.
4. Contact us for a repair. Describe any active flooding so the urgency is clear.

When to stop. Do not open the boiler or tighten internal joints. For severe flooding, turn off water at a known, safely accessible stop tap and seek urgent assistance.

1. Check whether one shower or all hot taps are affected. Do not test potentially scalding water with your hand.
2. Note whether another tap or appliance was using water at the same time.
3. For a combi, observe the display while one hot tap runs. Record any fault or repeated starting and stopping.
4. Tell us the model and whether the problem changes with tap flow.

When to stop. Repeated temperature swings need investigation. Do not remove or descale components inside the boiler.

1. Turn heating off and allow radiators to cool fully. Prepare the correct bleed key, a cloth and a small container.
2. Open the radiator’s bleed screw slowly by a small amount. Do not remove it. Let air escape and catch drips.
3. When air stops and water appears steadily, close the screw gently. Do not overtighten.
4. On a sealed system, check cold pressure afterwards and follow the boiler manual if topping up is needed.

When to stop. Stop if the screw is seized or leaking. Frequent air build-up or pressure loss needs an engineer.

Worcester Bosch: bleeding radiators ↗

1. Check heating is running and the radiator’s thermostatic valve is set above the room’s current temperature.
2. Keep furniture, curtains and covers away from the valve so it can sense the room.
3. If the top stays cold while the lower part warms, use the bleeding guide. If the bottom stays cold, tell us rather than repeatedly bleeding it.
4. Note whether it ever gets warm and whether nearby radiators are affected.

When to stop. Do not loosen valve nuts, pull valve pins or change lockshield settings at random. Persistent cold spots need assessment.

1. Check the main thermostat is not being warmed early by sunshine or a nearby heat source.
2. Confirm the slow room’s radiator valve is open and the radiator is not hidden behind large furniture.
3. Record which rooms reach temperature first and whether any radiator stays cold at the top or bottom.
4. Ask us to assess system balance and radiator sizing if the pattern persists.

When to stop. Do not assume a power flush or larger boiler is the answer. Establish the cause before choosing work.

1. Check the display and replace user-replaceable batteries if low, following the instructions.
2. Check the date, time, schedule, holiday mode and any temporary override.
3. Set a short heating boost above room temperature. Note whether the controller and boiler show a demand.
4. For app controls, check whether the physical thermostat still works. Use the brand’s connection guidance; avoid factory resets or re-pairing as a first step.

When to stop. Contact us with the control model and visible light pattern if demand does not reach the boiler. Do not open the receiver or touch wiring.

1. Check for manual overrides, boost, frost protection and other heating zones calling for heat.
2. Turn heating off at the normal controller and allow for residual radiator heat or normal pump overrun.
3. Note whether radiators heat up when hot water runs or when a cylinder is being heated.
4. Send us the control model and a description of when the heating comes on.

When to stop. If it continues heating with no demand, arrange a repair. Do not force motorised valves or alter wiring.

1. Check the zone’s thermostat schedule and target. A room already at temperature may have a cool floor.
2. Allow the normal warm-up time. Thick screeds can respond slowly after a long setback.
3. Note whether one zone or all zones are affected, and whether radiators or hot water still work.
4. Photograph visible controller indicators and manifold labels without removing covers.

When to stop. Do not adjust blending valves, flow meters or wiring without the system settings and an engineer’s advice. Report unusually hot floors or leaks promptly.

1. Confirm whether you have a combi or a separate hot-water cylinder before changing settings.
2. On a suitable combi, radiator-water temperature can sometimes be reduced gradually for efficiency. Follow the manual and check the home still reaches a comfortable temperature.
3. If the boiler heats a cylinder, get advice before reducing its temperature. It must still heat stored water safely; do not apply combi advice to a cylinder system.
4. Record the original setting so you can restore it if comfort suffers.

When to stop. Do not reduce cylinder hygiene settings or installer parameters. Weather-compensated and specialist systems need their own guidance.

Energy Saving Trust: boiler flow temperature ↗

1. Start with the times you are usually home and allow warm-up time before you need comfort.
2. Adjust room temperatures gradually and use radiator valves to avoid overheating rooms.
3. Keep thermostats away from draughts and local heat sources. Keep radiators and sensors unobstructed.
4. Review after a week. For heat pumps or slow underfloor systems, ask for a suitable strategy rather than copying a boiler on/off schedule.

Keep comfort in mind. Maintain adequate warmth and ventilation for the people and building. Savings depend on the home, system and tariff.

Energy Saving Trust: heating controls ↗

1. Select heating or cooling, not fan-only. Set the target above room temperature for heating or below it for cooling.
2. Check remote batteries, timer and sleep settings. Allow the normal start-up delay in the user manual.
3. Make sure indoor airflow is unobstructed. Check accessible filters using the manufacturer’s cleaning instructions.
4. If indoor units share an outdoor unit, check mode restrictions. Many domestic multi-split systems cannot heat and cool different rooms simultaneously.

When to stop. For a code, persistent icing, burning smell, tripping or indoor water leakage, stop using the unit and arrange help. Do not open electrical or refrigerant compartments.

1. Switch off and isolate as the user manual directs. Only access the user-cleanable filter panel; do not remove service covers.
2. If safely reachable, remove the specified filters carefully. Follow the manual: not every filter type can be washed.
3. Vacuum or wash only as permitted. Let washed filters dry fully out of direct heat before refitting.
4. Refit securely and resume operation. Check filters at the interval stated for your model and usage.

When to stop. Do not spray cleaner inside, touch internal fins or stand on furniture. Leave deep cleaning, drains and refrigerant work to a qualified engineer.

Daikin: AC maintenance ↗

1. Note whether water is indoors or outdoors and whether the system is heating or cooling.
2. In heating mode, outdoor defrost can temporarily interrupt warm air and produce outdoor water or vapour. Check the manual for normal behaviour.
3. Indoor dripping, ongoing heavy ice or a fault code needs attention. Switch off and protect the area if safe.
4. Take a photo from a safe position. Tell us the mode, model and how long it lasts.

When to stop. Do not chip ice off, pour hot water onto the unit, open drain connections or keep running a leaking indoor unit.

1. Choose heating or cooling for a clear seasonal goal. Auto changeover behaves differently between models.
2. Set the temperature you actually want rather than an extreme target. Use fan and swing controls to spread air without direct draughts on beds or seats.
3. Keep doors and windows appropriately closed while conditioning the room. Use shading to reduce solar heat.
4. Use the timer around your routine, check filters regularly and retain appropriate background ventilation.

Need more help? Ask about persistent discomfort or unexpected energy use. Running costs depend on conditions, efficiency and electricity price.

1. Choose a boiler service for routine planned maintenance when the appliance works normally.
2. For a fault, no heating, no hot water or a leak, request a repair and describe the problem when booking.
3. A landlord gas safety check has a different purpose from a service. If you need both, ask for both explicitly.
4. Have the make, model and service history ready and allow clear access to the boiler.

Safety first. For a safety concern, follow the emergency guidance instead of waiting for a routine appointment.

1. Find the installation date, registration confirmation and guarantee paperwork.
2. Check the manufacturer’s record and maintenance conditions. A brochure headline does not confirm individual cover.
3. If Heat installed it, contact us with your address, model and fault so we can help identify the appropriate route.
4. If you have a care plan, check its terms and claim process before instructing a separate repair.

Safety first. Do not delay a gas or CO emergency while looking for paperwork. Cover and authorisation must be confirmed for the individual job.

1. Start with a diagnosis and an itemised repair price where possible.
2. Compare condition, parts availability, recent faults and remaining guarantee.
3. Consider whether it still meets the home’s heating and hot-water needs after any extension or bathroom change.
4. Ask for the replacement scope, controls, system work and guarantee in writing so the comparison is fair.

Our starting point. A reliable existing boiler may be worth repairing. We need the condition and fault details before recommending replacement.

1. Tell us how many bathrooms may be used together and whether you already have a cylinder.
2. Heating output should reflect the property’s heat loss. Combi hot-water performance also depends on incoming water flow and temperature.
3. Discuss controls, minimum output, siting, servicing access, noise and guarantee.
4. A survey confirms water and gas supply, flue route and the work needed. An online estimate is a starting point.

Choose for the home. Do not select solely by bedroom count or the largest advertised hot-water output.

1. List which rooms need cooling, heating or both, and when you use them.
2. Tell us about roof windows, sun-facing glass, insulation and planned building work.
3. Consider indoor airflow, outdoor space, neighbours, maintenance access and condensate drainage.
4. A survey should confirm capacity, pipe routes, electrical requirements and relevant property or planning permissions.

Plan around the property. Floor area alone is not enough for reliable sizing. Ask for a design and installation scope suited to the home.