How to bleed or vent a boiler pump?

28th February 2020


	How to vent or bleed a boiler pump?


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			Why would you need to bleed a boiler pump?
			If you replace your boiler pump or if you have to drain your central heating system for any reason, it is possible for air to get trapped in your boiler pump.

			Running a pump that has air in it can cause it to become damaged and burn out. (Don’t worry – they don’t actually set on fire!)

			This can be avoided by bleeding the air out of the pump. This process is also known as venting.

			Bleeding a boiler pump
			Step 1 – Turn off power Turn off the power at the fuse box and make sure it cannot be accidentally reconnected.

			Step 2 – Protect against water damage Use the gate valves either side of your boiler pump to cut off the water supply using grips or pliers.

			Put down towels to protect flooring or electrics.

			Step 3 – Remove bleed screw cover plate Remove the bit that is currently in your multitool’s bit holder. Use the long, flat bit in the multitool’s handle to unscrew the bleed screw cover plate by twisting anti-clockwise.

			You will know that you have successfully bled the air out of your pump when water begins to trickle out when you turn the shaft.

			Step 4 – Replace bleed screw cover plate Replace the bleed screw cover plate and mop up any spillage.

			Step 5 – Reconnect power You can now reconnect the power and reactivate your pump.