Residual electrical power to coil    

• Lift the solenoid coil slightly (do not remove completely as an a.c. coil will burn out quickly) to feel if there is residual magnetic field.
• Check wiring
• Check lead connections
• Remove electrical DIN connector from coil to isolate coil.

Dirt Ingress under diaphragm or seal.   

• Isolate the solenoid valve
• Remove the power supply
• Drain system and carefully remove solenoid valve diaphragm avoid loosing small parts or internal springs, remember seal position or take a photo so new seal is installed correctly.
• Inspect the seat in the valve's body and the underside of the diaphragm or seal - clean as required.

Manual Over Ride Facility

• Check the position of the manual over ride and adjust accordingly.

Upstream pressure pulse

• Check inlet and outlet pressure differential and flow are correct for the solenoid valve being used.
• Check other valves downstream in the system are not generating excess back pressure.

Pressure difference inlet/outlet too high

• Reduce inlet pressure or install pressure reducing valve.
• Install correct solenoid valve to meet the system pressure requirements.

Outlet pressure sometimes higher than inlet pressure

• Install non return valve downstream of solenoid valve to prevent back flow.
• Check pressure control valves in system are correctly set up.
• Install bi-directional solenoid valve, coaxial valve or angle seat piston valve that are designed to control flow in both directions.

Bent or distorted armature tube

• Isolate electrical supply
• Drain system
• Carefully remove armature assembly, which will have small internal parts and replace.
• Install a well ventilated guard to protect the solenoid valve.

Damaged diaphragm base or valve seat   

• Replace solenoid valve.
• Check solenoid valve is in accordance with system requirements.

Inverted diaphragm    

• Isolate the solenoid valve
• Remove the power supply
• Drain the system and carefully remove solenoid valve diaphragm, avoid loosing small parts or internal springs and install new seal correctly.

Dirt Ingress in solenoid valve armature tube   

• Isolate the electrical supply
• Drain the system
• Carefully remove armature assembly, this will have small internal parts.
• Clean armature assembly or replace.
• Install a filter, such as our RPE filter assembly to remove debris in media and/or try to mount solenoid valve with armature vertical so any small particle debris will tend to gravitate down and flush out.
• If the armature assembly has lime scale build-up due to hard water it is advised to install a water softener into the system to prevent lime scale in all systems.

Corrosion in pilot orifice

• Isolate electrical supply drain system and replace damaged components.
• Check solenoid valve specification is suitable for the application.

Solenoid valve installed wrong way around     

• Check that the solenoid valve flow direction in in line with the system flow requirements, typically solenoid valve is marked inlet and outlet, flow arrow or port 1 (IN) and port 2 (OUT).
• Pressure assisted solenoid valves usually have their coil mounted over the outlet.
• View internal thread of valve as outlet is typically deeper/longer than inlet side.

Lost components during maintenance  

• Replace components according to manufacturers spares listing.
• Try to remove any parts carefully and it is helpful to use your phone camera as a reference for he re installation procedure.