other day we had acold snap and my hose reel and delivery hose to the reel from pump froze up even though everything is lagged. Anyway today i removed the delivery hose from outlet of pump to the reel to thaw out. Once done i place back on and checked pump was running. All ok at this point but when i close the valve on hosereel the pump winds up in speed till it stops but the green light stays on now. Prior to all of this it would go red and flick on / off every so often to green but then back to red.
any ideas what has changed here.