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Boiler Fault Finder

240 V TEST

 240 V TEST Connect boiler to power supply via 3 pin plug top or inserting 3 amp fuse into switch Ensure boiler is on but with all controls off, so there is no demand Set multimeter to correct voltage scale on V AC Firstly put the black lead from multi…240 V TEST was last modif
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Mains voltage and polarity tests

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 all c
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Resistance to Earth

Resistance to earth: (dead test) This test confirms the integrity (resistance) of the insulation between L and E on the boiler terminal strip or plug top pins (Black lead firstly to E pin and red lead secondly to L pin). Where the boiler supply is connected to a fused double…Re
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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 First put black lead from multi mete
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Earth Continuity Test

Earth continuity test: (dead test) This 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 are earthed correctly. Electrically isolate power supply at fused spur switch
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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 switch and remove fuse (Always ensure
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Electrical Safety Checks for Heating Engineers

Electrical Safety Checks

Electrical Safety Checks was last modified: December 14th, 2018 by Boiler Fault Finder
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