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Boiler Fault Finder

Spark electrode(s)

Spark electrode(s) was last modified: May 17th, 2019 by Boiler Fault Finder
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Cylinder thermostats

Cylinder thermostats was last modified: May 17th, 2019 by Boiler Fault Finder
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Room thermostats

Room thermostats was last modified: May 17th, 2019 by Boiler Fault Finder
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Diverter valves

Diverter valves was last modified: May 17th, 2019 by Boiler Fault Finder
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Motorised valve heads (diverter valves)

Motorised valve heads (diverter valves) was last modified: May 17th, 2019 by Boiler Fault Finder
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S Plan (HW zone valve and HTG zone valve)

S Plan (HW zone valve and HTG zone valve) was last modified: May 17th, 2019 by Boiler Fault Finder
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Y Plan (3 port mid-position valve)

Y Plan (3 port mid-position valve) was last modified: May 17th, 2019 by Boiler Fault Finder
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Synchronous motors (within zone valves)

Synchronous motors (within zone valves) was last modified: May 17th, 2019 by Boiler Fault Finder
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Actuator Heads (motorised valves)

Actuator Heads (motorised valves) was last modified: May 17th, 2019 by Boiler Fault Finder
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Solenoids & Moduregs

Solenoids & Moduregs was last modified: May 17th, 2019 by Boiler Fault Finder
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Low water pressure switches

Low water pressure switches was last modified: May 17th, 2019 by Boiler Fault Finder
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Domestic hot water and primary micro switches

Domestic hot water and primary micro switches was last modified: May 17th, 2019 by Boiler Fault Finder
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Primary Water Flow Switches

Primary Water Flow Switches was last modified: May 17th, 2019 by Boiler Fault Finder
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Domestic Hot Water Flow Switches

Domestic Hot Water Flow Switches was last modified: May 17th, 2019 by Boiler Fault Finder
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How to test boiler air pressure switches - boiler fault finder

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.
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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 hoses / loose hose connections Condensation withi
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Air Pressure Switches

Air Pressure Switches was last modified: October 27th, 2014 by Boiler Fault Finder
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Thermostats

… This content is for Annual Subscription and Annual Subscription Special members only. Please login to view this content. (or Register here.)Thermostats was last modified: May 15th, 2014 by Boiler Fault Finder
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Thermostats – Over heat Cut Out

Thermostats – Over heat Cut Out was last modified: May 17th, 2019 by Boiler Fault Finder
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Thermostats – Liquid Expansion

Thermostats – Liquid Expansion was last modified: May 17th, 2019 by Boiler Fault Finder
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Potentiometers Intro

Potentiometers Intro was last modified: May 17th, 2019 by Boiler Fault Finder
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How to test a potentiometer

How to test a potentiometer was last modified: May 17th, 2019 by Boiler Fault Finder
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Potentiometers

… This content is for Annual Subscription and Annual Subscription Special members only. Please login to view this content. (or Register here.)Potentiometers was last modified: May 15th, 2014 by Boiler Fault Finder
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Thermistors

Thermistor faults Thermistors work in conjunction with the user potentiometer (boiler setting for temperature), and the Printed Circuit Board (PCB). A small Direct Current (DC) is sent to the thermistor via the potentiometer, the PCB then knows whether to give more, or less gas to ens
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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)  Burnt Out Motor Windings Electrically i
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Pumps

Reasons a pump will fail to start: No 240V supplying (L) & (N) terminals Faulty capacitor Rotor shaft seized or debris preventing impeller rotation Burnt out motor windings Worn out bearings  240 V LIVE TEST Always check across red or brown and black or blue with multimeter set on
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Boiler System Component Testing for Heating Engineers

System Component Testing

Boiler System Component Testing - for Heating Engineers
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