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Don’t stand in front of a boiler with an error code, save time get the APP. Some boilers save a history of faults, that will tell us what is wrong. With the F.22 APP you can contact 17 boiler support lines. The two books are packed with hints & tips on testing parts, flow charts for quick diagnosis 👍 Please Like and share this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one!🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ Take care, George Staszak Mr Combi #MrCombi #BoilerRepair #HeatingTips
Error Code? Don't Panic, we have an APP for that
An Auto By Pass is a small £30 component that can make a big difference to modern boilers, especially combies. It helps maintain correct water flow when radiator valves close, reducing strain on the pump and heat exchanger. This improves boiler efficiency, lowers energy use, and helps the system run more quietly and smoothly. "Has an installer ever given you one of these excuses? Let me know in the comments which one!" An Auto By Pass can also help prevent overheating, kettling, and unnecessary breakdowns, potentially saving homeowners from costly repairs and extending the life of the boiler system. Check yours today Homeowner or installer grab Mr Combi’s Yellow Fault Finding Book today. Full of helpful advice written for the non expert to understand Stop guessing, start fixing, and get your heating back on fast. 👍 Like this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one! 🌐 https://mrcombi.com/📘 https://mrcombi.com/shop/🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ Take care, George Staszak Mr Combi #MrCombi #BoilerRepair #HeatingTips
“Why Boilers Fail WITHOUT an Auto By Pass Valve”
Maintaining correct boiler pressure and a healthy expansion vessel is vital for a safe, efficient heating system. The expansion vessel acts as a buffer, absorbing the increased volume of water as it heats up. Without the correct pre-charge or property-specific pressure, the safety valve may discharge, causing persistent pressure loss and damaging internal components. While a bungalow might function well at 1.0 bar, a multi-story town house needs a higher baseline to push water to the top floor. Neglecting this balance is a hidden fault that leads to noise, cold radiators, and expensive, avoidable repairs. The Unseen Fault Getting the pressure wrong for your specific property type is an often unseen fault that leads to noisy pipes, cold radiators, and unnecessary boiler wear. While a bungalow might run perfectly on lower settings, a three-story town house requires a different balance to push water to the top floor effectively. If you're ignoring the height of your home when setting your gauge, you’re likely overlooking a simple fix for poor circulation and system inefficiency that many engineers miss during a standard service. Is Your Pressure Right? The Best Boiler Settings for Bungalows Semis and Town Houses This video provides specific pressure guidelines for different home layouts to prevent common efficiency issues. Mr Combi’s Yellow Fault Finding Book and APPs could have the exact answer you need. Homeowner or installer grab Mr Combi’s Yellow Fault Finding Book today. Full of helpful advice written for the non expert to understand Stop guessing, start fixing, and get your heating back on fast. 👍 Like this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one! 🌐 https://mrcombi.com/📘 https://mrcombi.com/shop/🍎 Apple Apps: https://mrcombi.com/apps/🤖 Android Apps:https://mrcombi.com/apps/ Take care, George Staszak Mr Combi #MrCombi #BoilerRepair #HeatingTips
Is Your Pressure Right? Check and FIX it's EASY
From stuck diverter valves to faulty thermostats or low system pressure, the cause is usually hiding in plain sight. In this video, I’ll show you exactly what to check first and how to diagnose the problem like a pro. Mr Combi’s Yellow Fault Finding Book and APPs could have the exact answer you need. "What's the most common boiler error code you've seen?" Let me know in the comments below Homeowner or installer grab Mr Combi’s Yellow Fault Finding Book today. Full of helpful advice written for the non expert to understand Stop guessing, start fixing, and get your heating back on fast. 👍 Like this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one! 🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ Take care, George Staszak Mr Combi #MrCombi #BoilerRepair #HeatingTips
Popular Faults that are EASY 2 FIX B 4 U Call
"You’ve just spent thousands on a new boiler, thinking you’ve solved your heating bills. But here’s the truth: without the right controls, that boiler is essentially 'brainless' high bills and inefficient. 👍 Like this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one! 🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ If your installer didn't suggest advanced controls, you're literally burning money. It's time to stop the heat bleed and unlock peak performance." Close-up of a basic mechanical stat vs. a modern OpenTherm or weather-compensating control. "Many installers stick to what they know because it’s a 'quick fix.' But don’t settle for 'basic.' If they aren't talking to you about modulation, they're leaving your efficiency on the table. Using a 1960’s room stat to control on a modern boiler is like putting wooden wheels on a Ferrari; you’re literally burning money through inefficient cycling and overshooting temperatures. Installers stop the waste and unlock the true energy-saving potential of your heating system. For the professional diagrams and step-by-step wiring maps to upgrade any system safely, grab my Wiring and Fault Finding books today, also get the APPs. A new combi boiler should deliver high efficiency, but outdated controls can hold it back. Many systems are still fitted with old room stats and basic timers, forcing boilers to run too hot and waste energy. #MrCombi #BoilerRepair #HeatingTips
Boilers are Ruined by OLD Controls
Most homeowners believe their boiler is properly serviced every year, but in reality many services are rushed and incomplete. Installers are often overloaded with too many jobs in a single day, leaving little time for a thorough inspection. 👍 Like this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one! 🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ A shortage of experienced breakdown engineers only makes the problem worse, increasing pressure on installers and service engineers. Important checks such as combustion analysis, safety inspections, and system performance are sometimes skipped. If the boiler is under manufacturer guarantee, the heating system water quality must be checked annually to keep the warranty valid. Mr Combi books and APPs help engineers learn how to properly test parts and confidently take on every job. #MrCombi #BoilerRepair #HeatingTips
"Boiler Servicing: The Dangerous '15-Minute' Con"
Setting the correct water temperature makes a big difference to heating efficiency. A combi boiler works most efficiently with a flow temperature of 60°C, allowing good heat output from radiators while helping the boiler operate efficiently. An air source heat pump performs best at much lower temperatures, typically around 35°C, because it is designed to run slowly and steadily. 👍 Like this video 📲 Subscribe to the Mr Combi channel for proven heating and diagnostic tips 💬 Drop a comment below — I reply to every single one! 🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ Lower temperatures improve efficiency and reduce energy use. Understanding these temperatures helps homeowners save money on energy bills while keeping their homes warm and comfortable. Mr Combi channel is totally independent and not sponsored. All information is from my being a registered installer and trainer for over 40 years, and from factory contacts for proven heating and diagnostic tips. Were are here for installers & homeowners We have over 250 videos about domestic central heating save money, how to test parts, which controls to have or avoid. #MrCombi#BoilerRepair#HeatingTips
Which is the Best Most Efficient Temperature for a Boiler and Heat Pump?
The air pressure switch is a critical safety device—if it doesn’t prove airflow, your boiler shouldn’t fire. Testing it properly helps you catch blocked flues, fan faults, split tubes, and dangerous combustion issues before they become breakdowns or safety risks. Guesswork costs time and money. Mr Combi channel for proven heating and diagnostic tips, were are here for installers & homeowners 💬 Drop a comment below — I reply to every single one! 👉 Please Like the video, subscribe to the channel, and start using your head instead of your back. 🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ Mr Combi’s book gives you clear test methods, real fault scenarios, and step-by-step logic, so you diagnose fast, fix right first time, and work with confidence on every job. #MrCombi #BoilerRepair #HeatingTips
Boiler Fan Running But No Ignition – Check This First
If you want to stay sharp in this trade, you’ve got to train like a pro and work like a pro. Download all 8 Apps and don’t just own them – practice with them.Use them on real jobs, fault-finding calls, breakdowns, controls, wiring, combustion checks. The more you use them, the faster and more confident you become. And don’t turn up to a job empty-handed.Carry both books with you on every single job.They’re not ornaments for the van or the kitchen table – they’re tools.When you’re stuck, tired, or under pressure, those books save time, money, and stress. But it doesn’t stop there. You must keep training.Aim for at least four factory training courses every year.Boilers change. Controls change. Faults change.If your knowledge doesn’t keep up, you fall behind – simple as that. We owe it to ourselves, our customers, and our bodies to work smarter, not harder.The best engineers aren’t guessing – they’re prepared. So download the Apps.Use them daily.Carry the books.Book the training. Keep your skills at the highest level – because average engineers struggle, and professionals stay in demand. 💪🔥 Mr Combi channel for proven heating and diagnostic tips, were are here for installers & homeowners 💬 Drop a comment below — I reply to every single one! 👉 Please Like the video, subscribe to the channel, and start using your head instead of your back. 🌐 https://mrcombi.com/ 📘 https://mrcombi.com/shop/ 🍎 Apple Apps: https://mrcombi.com/apps/ 🤖 Android Apps:https://mrcombi.com/apps/ #MrCombi#BoilerRepair#HeatingTips Take care, George Staszak Mr Combi© https://www.remeha.co.uk/services/training https://www.baxi.co.uk/professional/training/product-training-courses https://www.vokera.co.uk/trade-professionals/training/ https://www.expert-academy.co.uk/w/courses/cat-39-in-person-training/ https://www.myvaillantpro.co.uk/training https://www.worcester-bosch.co.uk/professional/training-home https://www.intergasheating.co.uk/trade/customer-service/courses/
“Boiler Fault Finding & Heating Advice – From a Professional Engineer”
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