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 (brown)
- Crocidolite (blue)
These are usually referred to as their common names (shown above in brackets), although they cannot be identified by their colour. Laboratory analysis is needed for positive identification.
Asbestos fibres enter the body through breathing, via the nose and mouth. They cannot enter the body through the skin or via food and drink as this will pass through.
Disease is caused by tiny fibres of asbestos passing into the lungs where they can stay for many years. Small but repeated exposure on different jobs over time can lead to the development of an asbestos-related disease, which can take anything from 15 to 60 years to develop.
THIS IS WHY IT IS CRUCIAL TO PREVENT EXPOSURE ON EVERY JOB!
If in doubt or suspect asbestos– STOP WORK IMMEDIATELY!
The following list has been compiled to aid you and minimise the risk from exposure, however, the list cannot be considered to be definitive, and any material you do suspect as asbestos should be treated as such. There may be other appliances containing asbestos materials that do not appear on the list. Specialist advice should be sought from the manufacturer prior to commencing any work and where necessary, specialist licensed asbestos removal companies used.
Boilers known to contain asbestos
The Flame Detection Electrode in Combi Boilers: Its Purpose and Importance
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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Boiler Faults and Error Codes
Boiler Fault Error codes listed with fault codes and how to solve. Heating Engineers.
Worcester Bosch Greenstar 30-40 CDi Classic Boiler Error Codes
Worcester Bosch Greenstar 30-40 CDi Boiler Error Codes
Potterton Promax Combi Boiler System and Store Error Codes
Potterton Promax Combi Boiler System and Store Error Codes
Potterton Gold Combi and System and Titanium Combi Boiler Error Codes
Gold Combi and System and Titanium Combi Boiler Error Codes
Glow-Worm Xtrafast 96-120E1 Boiler Range Error Codes
Glow-Worm Xtrafast 96-120E1 Boiler Range Error Codes
Glow-Worm Xtrafast 96-120 Boiler Range Error Codes
Glow-Worm Xtrafast 96-120 Boiler Range Error Codes
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The professional heating engineer’s complete “Boiler Fault Finder” for boiler and central heating fault finding.
About Boiler Fault Finder
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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Asbestos
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 (...
Boiler Servicing Procedure
Service procedure for boiler and heating engineers when visiting and servicing all types of commercial boiler
Mains voltage and polarity tests
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
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
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
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...
Earth Continuity Test
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.
General 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...
Maximising boiler condensation operation
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 Guides
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...
Sequence of Boiler Operation
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.
Service Engineer's Toolkit
Heating Engineer and Plumbers Service Toolkit items required to fix boilers and other heating equipment.
Air Pressure Switches (Testing)
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 (General)
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...
Thermostats
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...
Boiler Fans
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) ...
Circulating Pumps
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.
Top Tips for the Heating Engineer
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...