Pool and Spa
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28.5 VAc is OK, within acceptable range. If the fuse link just above and outside the burners keeps blowing then you need to clean the heat exchanger and/or check for downdraft or other venting issues.
The link is a one and done device. The only time it will blow is if it gets too hot. I listed the reasons it might get too hot in my first answer. You have to take the unit apart and check/clean the heat exchanger. We I say vent I mean the exhaust (vent).
Dirty burners would cause delayed ignition not this problem. You might be able to get the all of the fins in the heat exchanger by removing the top enclosure.
How did it go?
Did you clean the heat exchanger?
Then if there are no issues with the flue and the exchanger is spotless the only other possibility is that it's over fired. You need to put a gauge on the burner manifold to check the gas pressure. You need a gauge that reads in inches WC (water column)