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Trianco eurostar oil boiler 70/90. Runs for 5 mins from cold

Customer Question

Trianco eurostar oil boiler 70/90. Runs for 5 mins from cold then shuts down. The red light appears on control box inside boiler housing. After 1 to 2 minutes I reset control box button, boiler runs again for less time maybe 1 minute because its already warm. I have change control box and tried to by pass the thermostat dial switch on boiler front with no joy. What is the next move from your judgement. What do i change next? The boiler was serviced 8 months ago.
Thanks
Submitted: 5 years ago.
Category: Plumbing
Expert:  Patrick replied 5 years ago.
I looked at fault finding in the Owner's manual. It sounds like water in the fuel or fuel related item regarding air or valve. Have you checked?

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30 years commercial construction and 23 years house remodeling projects