I would check to see what the system says the water flow is first. Then make sure it meets the manufacturer's specs. Other issues could be gas pressure. I have never worked on a Marey before but most newer models rely on a balanced gas pressure for proper air/ gas mixture, if the gas pressure fluctuates too much the burner could cut out due to a poor flame signal.
Also make sure the intake air filter is not plugged up if there is one...





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