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- 19 Nov 2016
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we have a tiger loop GOK GS pro Fi 3 which needs bleeding every other day or so. the boiler runs fine once the loop has been bled but wont start up from cold until its bled again. it will only start once the lockout button is pressed after bleeding. worcester bosch greenstar utility with new pump, control box, coil and optic sensor. the tank is approx 300mm above the boiler floor level and is a top outlet ( with a floating pickup ) and antisyphon valve. Im assuming an air leak somewhere. any thoughts? ta in adv.