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Autotrol Valve Flow Rate Problem - Either Resin in Tank or Valve Discs not Opening Enough
Last Updated: 10/05/2010
Question:
 
I have a Autotrol 155 which seems to have a low flow rate while in the service mode. This was noticed over a few days due to an electric shower which was unable to operate correctly (either the water was cold or boiling hot) as the flow rate dropped below the shower units operational pressure. One last thing that has been noticed; when there is no other water usage in the house, you can turn a tap/faucet on, the water comes out at full pressure but quickly drops off to a very low flow. If the unit is bypassed then the normal pressure is restored. The unit has been installed for approximately 17 years.

Is there any advice you can shed some light on with?

Answer:

If the water source is chlorinated, it could be the Resin in the tank are breaking down into fine fragments and clogging the bottom distributor. They can easily be replaced, and this would restore normal flow rates.
See our Article on RESIN REPLACEMENT (WHEN, WHY & HOW)
 
OR if the Timer Assembly is not DOWN and LOCKED in by the Timer Retaining Pin ( 5F ) or the Out Put Connector on the Back of the Timer Assembly is cracked ( SEE: CAMSHAFT OUTPUT CONNECTOR 21E/1031496 ), then the camshaft may not be holding open the # 2 and # 3 Valve Discs to allow proper flow through the Valve.

Also See
REBUILDING THE AUTOTROL 155 ( 1550-TC ) VALVE BODY





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