Boiler Fault Finder

Spark electrode(s)

Spark electrode(s) Reasons spark electrode(s) will fail to start: Cracked ceramic insulation (causing leakage) Poor terminal connections Incorrect spark gap between electrode(s) or between electrode…
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Cylinder thermostats

Cylinder thermostats Reasons a cylinder thermostat will fail to start: Poor terminal connections Switch contact faulty Faulty timer/programmer When the timer/programmer is on, it sends…
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Room thermostats

Room thermostats Reasons a room thermostat will fail to start: Poor terminal connections Switch contact faulty Faulty timer/programmer When the timer/programmer is on, it sends…
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Diverter valves

Diverter valves Reasons a diverter valve will fail to move: Wax capsule faulty Bobbin assembly faulty Faulty motorised valve head Seized push rod Contaminated system…
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Motorised valve heads (diverter valves)

Motorised valve heads (diverter valves) Reasons a motorised valve head will fail to start: Motorised valve head lead faulty Burnt out motor windings Motor axle/spindle…
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S Plan (HW zone valve and HTG zone valve)

S plan (HW zone valve and HTG zone valve) Suspect the zone valve as being faulty if the valve does not operate after the following…
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Y Plan (3 port mid-position valve)

Y Plan (3 port mid-position valve) Suspect the mid-position valve as being faulty if the valve does not operate after the following checks (in order):…
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Synchronous motors (within zone valves)

Synchronous motors (within zone valves) These small motors are powered by 240V AC to rotate a spring loaded gearing arrangement, which in turn, rotates the…
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Actuator Heads (motorised valves)

Actuators (motorised valves) Reasons an actuator will fail to operate: Burnt out synchronous motor windings Valves spindle seized /sludge contamination Auxiliary switch (end switch) burnt…
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Solenoids & Moduregs

Solenoids Reasons a solenoid will fail to operate: Burnt out coil Poor terminal connection Loose mountings Armature sticking (Foreign matter accumulation jamming the armature) Faulty…
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