This Dyson DC14 came into the workshop with a couple of problems. The first was a lack of suction power and the second was a horrible noise from the front of the vacuum cleaner. It got to the workshop just in time.
A bypass valve is fitted to most vacuum cleaners without a bag and is there to prevent damage if a blockage exists somewhere in the airways or the owner has neglected to empty the collection bin. In this case, the valve seemed to be stuck open, causing suction power to be lost.
The valve on the DC14 (other Dyson models are similar) is a small device situated near the exhaust filter. the valve itself is a clear tube with a rubber sealed cap controlled by a spring. In normal operation, the cap seals a hole to the outside world, but if there’s a blockage, the pressure of the spring is overcome and air is allowed past the cap.
In this case, the valve was dirty and stuck. Repair required dismantling with normal household tools (small screwdriver and pliers) and cleaning using a damp cloth. A small squirt of silicone spray on the rubber seal ensured a smooth operation upon reassembly.
The noise was traced to the front of the vacuum cleaner. The roller/ beaters were making a horrible noise when in use and it wouldn’t have been too long before complete failure would have occurred.
Spare roller/ beaters are readily available from Dyson directly and from many aftermarket suppliers at reasonable prices. Since the beaters were in good condition, it seemed reasonable to have a go at a repair. The small ball bearing races at each end of the beater are easily removed and upon inspection, both were very stiff in operation. Fortunately, the bearings used by Dyson were of good quality and as the dust covers were easily removed, all that was required was a clean with solvent cleaner and a re-grease. Once refitted, the roller/ beaters sounded as they should again.
Cost of a replacement Dyson vacuum cleaner, circa £250, cost of repair £1 (bit of cleaner, grease, silicone spray.