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Hello. My name is Tan.
Pull the hose off at the mixing elbow now check the fitting on the elbow is it clogged? If you have water to the elbow the elbow or the fitting on the elbow are clogged. This is a common spot for clogging.
Post back with findings.
The exhaust pressure should be pushing all the water out.
Have you inspected the heat exchanger for debris slowing the water flow? You might have water flow but is it enough volume.