Thermostats

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 – 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 (...

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A Website dedicated to boiler fault diagnosis and repairs for Heating Engineers

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

Alpha Boiler Error Codes

Atag Boiler Error Codes

Baxi Avanta Range Boiler Error Codes

Baxi Platinum Boiler Error Codes

Baxi Maineco Boiler Error Codes

Baxi Duo-Tec&Megaflo Boiler Error Codes

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Grant Boiler Error Codes

Glow-Worm Xtrafast 96-120E1 Boiler Range Error Codes

Glow-Worm Xtrafast 96-120 Boiler Range Error Codes

Glow-Worm Xtramax HE Boiler Range Error Codes

Glow-Worm Ultrapower SXI Boiler Range Error Codes

Glow-Worm Ultracom SXI Boiler Range Error Codes

Glow-Worm Ultracom HXI Boiler Range Error Codes

Glow-Worm Ultracom CX Boiler Range Error Codes

Glow-Worm Ultracom CXI Boiler Range Error Codes

Glow-Worm Ultracom2 35 Store Boiler

Glow-Worm Ultracom2 SXI Boiler Range Error Codes

Glow-Worm Ultracom2 CXI Boiler Range Error Codes

Glow-Worm SXI Boiler Range Error Codes

Glow-Worm SL Boiler Range Error Codes

Glow-Worm HXI Boiler Range Error Codes

Glow-Worm Flexicom SX Boiler Range Error Codes

Glow-Worm Flexicom HX Boiler Range Error Codes

Glow-Worm Flexicom CX Boiler Range Error Codes

Glow-Worm Cxi Boiler Range Error Codes

Glow-Worm Cl plus Boiler Range Error Codes

Glow-Worm Cl Boiler Range Error Codes

Glow-Worm Compact S Boiler Range Error Codes

Glow-Worm Compact E Boiler Range Error Codes

Glow-Worm Betacom C Boiler Range Error Codes

Glow-Worm Betacom A Boiler Range Error Codes

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Glow Worm Energy Range Boiler Error Codes

Ideal Boiler Error Codes

Main Boiler Error Codes

Potterton Promax Combi Boiler System and Store Error Codes

Potterton Promax Ultra Boiler Error Codes

Gold Combi and System and Titanium Combi Boiler Error Codes

Assure Combi Boiler Error Codes

Rinnai Tankless Boiler Error Codes

Viessmann Boiler Error Codes

Vaillant Ecomax Pro 828E Boiler Error Codes

Vaillant EcoMax Pro 18/28E Boiler Error Codes

Vaillant Turbomax Plus 824/8E Boiler Error Codes

Vaillant CI-SI Boiler Error Codes

Vaillant Ecotec Boiler Error Codes

Vaillant Boiler Error Codes

Worcester Bosch Boiler Blocking Error Codes

Worcester Bosch Boiler Locking Error Codes

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Worcester Bosch Greenstar 30-40 CDi Boiler Error Codes

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

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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.

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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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...

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

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.

ZANUSSI Boiler Manuals for heating engineers

WORCESTER Boiler Manuals for heating engineers

VOKERA Boiler Manuals for heating engineers

VIESSMANN Boiler Manuals for heating engineers

VAILLANT Boiler Manuals for heating engineers

TRIANCO Boiler Manuals for heating engineers

SIME Boiler Manuals for heating engineers

SAUNIER-DUVAL Boiler Manuals for heating engineers

SABRE Boiler Manuals for heating engineers

RAVENHEAT Boiler Manuals for heating engineers

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Protherm Boiler Manuals for heating engineers

Potterton Boiler Manuals for heating engineers

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MAIN Boiler Manuals for heating engineers

LAMBORGHINI Boiler Manuals for heating engineers

KESTON Boiler Manuals for heating engineers

JOHNSON and STARLEY Boiler Manuals for heating engineers

IDEAL Boiler Manuals for heating engineers

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EVO Boiler Manuals for heating engineers

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BROAG REMEHA Boiler Manuals for heating engineers

BRITISH SCOTTISH GAS Boiler Manuals for heating engineers

BOULTER-BURDERUS Boiler Manuals for heating engineers

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ATAG Boiler Manuals for Heating Engineers

ACV Boiler Manuals for Heating Engineers

ALPHA Boiler Manuals for Heating Engineers

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...

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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

Boiler Fault Finder Search

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.

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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.

See what others are saying about Boiler Fault Finder I have checked the topping before I purchase, I have found really useful ,giving sequence of boiler how work, test component when on demand and when in not like APS. found very useful. I am still...

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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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...