Thermostats

Combi boilers are widely used for their efficient heating and hot water supply capabilities. A key component in the functioning of a combi boiler is the flame detection electrode.

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Heating Engineers Boiler Installation and Service Manuals for all Boilers. Looking for that boiler installation manual for a boiler? Look no further, boiler fault finder has all the relevant boiler installation and service manuals.

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Alpha Boiler Error Codes

Boiler Fault Error codes listed with fault codes and how to solve. Heating Engineers.

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Glow-Worm Ultracom2 35 Store Boiler

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The professional heating engineer’s complete “Boiler Fault Finder” for boiler and central heating fault finding.

The professional heating engineer’s complete "Boiler Fault Finder" for boiler and central heating fault finding. "Boiler Fault Finder" results from years of experience as a professional service and repair engineer, demonstrating technical expertise w...

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Frequently Asked Questions General The system has locked me out - how can I log back in? This is usually caused from too many attempts to enter your password (you are only allowed 3 attempts and then the system will lock the account for 15 minutes...

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Asbestos – the hidden dangers! Asbestos components may take the form of seals, gaskets, insulation panels and rope within old appliances, especially aged boilers. There are three types normally encountered in the UK: Chrysotile (white) Amosite (...

Service procedure for boiler and heating engineers when visiting and servicing all types of commercial boiler

The 240V Test checks boilers for mains power supply to the boiler terminal strip.

This test will ascertain the correct polarity between L and N although, some boilers will operate unaffected by reversed polarity. Connect boiler to power supply via 3 pin plug top or inserting 3 amp fuse into switch Ensure boiler is on but with...

Resistance to earth: (dead test) This test confirms the integrity (resistance) of the insulation between L (Live) and E (Earth) on the boiler terminal strip or plug top pins (Black lead firstly to Earth pin and red lead secondly to Live pin). Check...

Short circuit: (dead test) This test will ascertain the integrity of the internal resistance of the boiler and should read no resistance/infinity between L and N on the 3 amp fused plug top pins. Set multimeter on ohms scale for resistance readings...

Mains voltage test: (dead test) This test isolates the power supply serving the boiler, so as safe, further testing can be continued, without the risk from stray electrical currents causing a shock. Electrically isolate power supply at fused spur...

The Earth Continuity Test will ascertain whether the earth continuity between the earth supply to the boiler and the internal component earth connections and the metal casing of the boiler is earthed correctly.

The professional heating engineer’s complete "Boiler Fault Finder" for boiler and central heating fault finding. "Boiler Fault Finder" results from years of experience as a professional service and repair engineer, demonstrating technical expertise w...

Boiler shuts down and goes to lockout Fault Fix faulty pump (not at full capacity) Check the pump for signs of damage, test the electrical connections, and replace if necessary. Replace pump head faulty fan (not at full...

There is now a requirement in the Domestic Building Services Compliance Guide that states that where condensing boilers are installed, the system should be designed to operate at lower temperatures to give a return water temperature less than 55 degrees...

Programmer and time switch compatibility guide Programmers do vary in their settings/functions and the differences are as follows: 24 hour programmer – one set of times all week 5/2 day – one set of times for week days/ another set of times for...

The Safe use of MultiMeters for Heating Engineers

What is the sequence of boiler operation for domestic boilers? This guide will take you through the boiler operations that happen when the boiler is being used.

Heating Engineer and Plumbers Service Toolkit items required to fix boilers and other heating equipment.

Boiler System Component Testing - for Heating Engineers

Testing the boilers Air Pressure Switch, is always an indicator that other problems may exist. This article helps to diagnose the Air Pressure Switch issues on a boiler.

Air pressure switches (operating @ approx. 0.5 – 4 m/bar pressures) See also: How to test your Air Pressure Switch with a multimeter Reasons an air pressure switch will fail to start: Loose electrical connections Kinked or split rubber h...

Boiler Fault Finding - Thermostats - See also: Cylinder Thermostats Room Thermostats Thermostats Overheat Cut out Thermostats Liquid Expansion Electrical Safety Checks - Resistance to Earth Top Tips for the Heating Engineer...

What is a thermistor used for in a combi boiler

Reasons a fan will fail to start No 240V supplying (L) & (N) terminals Burnt out motor windings Worn out bearings Air rotor jammed (on fan casing) impeller heavy with foreign matter accumulation Faulty fan speed control resistor (if fitted) ...

A failure of the circulating pump can cause a number of problems, such as reduced heating and hot water performance, and can result in the boiler shutting down.

It sometimes pays to test the air pressure hoses with (LDF) Leak detection fluid, when encountering ignition problems. (Hoses maybe split or have loose connections). Where the air pressure switch is difficult to access (which is most common), test...