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...
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...
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- Top Tips for the Heating Engineer
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- General Boiler Fault Finding
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- Using Multimeters to diagnose Boiler Faults