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Boiler Fault Finder

System Component Testing

Spark electrode(s)

Spark electrode(s) Reasons spark electrode(s) will fail to start: Cracked ceramic insulation (causin
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Cylinder thermostats

Cylinder thermostats Reasons a cylinder thermostat will fail to start: Poor terminal connections Swi
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Room thermostats

Room thermostats Reasons a room thermostat will fail to start: Poor terminal connections Switch cont
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Diverter valves

Diverter valves Reasons a diverter valve will fail to move: Wax capsule faulty Bobbin assembly fault
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Motorised valve heads (diverter valves)

Motorised valve heads (diverter valves) Reasons a motorised valve head will fail to start: Motorised
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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 n
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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
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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
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Actuator Heads (motorised valves)

Actuators (motorised valves) Reasons an actuator will fail to operate: Burnt out synchronous motor w
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Solenoids & Moduregs

Solenoids Reasons a solenoid will fail to operate: Burnt out coil Poor terminal connection Loose mou
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Low water pressure switches

Low water pressure switches Reasons a low water pressure switch will fail to start: Damaged / loose
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Domestic hot water and primary micro switches

Domestic hot water and primary micro switches Reasons a domestic hot water and primary micro switch
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Primary Water Flow Switches

Primary water flow switches Reasons a primary water flow switch will fail to start: Punctured / peri
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Domestic Hot Water Flow Switches

Domestic hot water flow switches Reasons a domestic hot water flow switch will fail to operate: Swit
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Thermostats

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Potentiometers

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Thermistors

Thermistor faults Thermistors work in conjunction with the user potentiometer (boiler setting for te
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Fans

Reasons a fan will fail to start No 240V supplying (L) & (N) terminals Burnt out motor windings
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Pumps

Reasons a pump will fail to start: No 240V supplying (L) & (N) terminals Faulty capacitor Rotor
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