If anyone can provide advice please,
We have an oil fired Potterton Statesman 70/90L boiler which along with a Danfoss Alpha pump, Drayton Digistat Thermostat, Digistat SCR wireless system, Drayton Lifestyle Timeswitch and two Drayton ZA5 acuator valves - all were fitted in 2005 - so now 12 years old.
I did change one of the click on acuators myself when it failed some three years ago.
The boiler has been serviced regularly each year and apart from the above the system has worked faultlessly.
In last couple of days the Danfoss Alpha pump has been staying on after the timeswitch has turned off the boiler. In this condition the acuator valves have both been turned to closed position and if the heating switch is pressed to call for heating the actuator valve moves to the open position - the hot water one opens too if that switch is pressed.
Both acuator valves close if the switches are pressed to off and the boiler switches off - - the pump however continues to run and the only way to switch it off is by turning off the electric supply to the system.
Advice on what is wrong please.
David.
We have an oil fired Potterton Statesman 70/90L boiler which along with a Danfoss Alpha pump, Drayton Digistat Thermostat, Digistat SCR wireless system, Drayton Lifestyle Timeswitch and two Drayton ZA5 acuator valves - all were fitted in 2005 - so now 12 years old.
I did change one of the click on acuators myself when it failed some three years ago.
The boiler has been serviced regularly each year and apart from the above the system has worked faultlessly.
In last couple of days the Danfoss Alpha pump has been staying on after the timeswitch has turned off the boiler. In this condition the acuator valves have both been turned to closed position and if the heating switch is pressed to call for heating the actuator valve moves to the open position - the hot water one opens too if that switch is pressed.
Both acuator valves close if the switches are pressed to off and the boiler switches off - - the pump however continues to run and the only way to switch it off is by turning off the electric supply to the system.
Advice on what is wrong please.
David.