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chaffoteaux 2A water heater?

I have a gas fired Chaffoteaux water heater,
the pilot is lit, but no hot water.
At the sink tap, the water flow is very low, which isnt enough to fire up the burner.
I have looked at the diaphragm which seems ok.
Could it be an airlock? If so , how to bleed it.
Any advice please.
sean keller, November 2010
Looks can be deceptive with the diaphragm

Carefree, November 2010
link Click here to see other fixes for Chaffoteaux.