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You may have debris in the line for the bathroom sink or debris in the faucet. If the water flow drops below the minimum flow for the heater it cant tell if the water is flowing to heat it up.
All of the other fixtures in the house work fine and get hot water?
If you turn on the tub to hot water and run the sink also, does hot water come out of the faucet?
Be some other issue with the faucet that does not allow proper flow of water.
It could be the flow sensor. However, I believe its the flow to the faucet because the kitchen works fine.
The length of the pipe doesn't matter in this case, it's the flow of the water to the fixture. If you turn on the kitchen sink hot to a dribble it wont activate the boiler.
I believe it's the flow of water to the sink that is blocked up. Not an issue with the boiler. All of the other fixtures have hot water except one. That tells us the boiler is working fine. If there was no hot water to any fixture we definitely would be diagnosing a boiler issue.
I would recommend taking the sink faucet apart and purging the lines and checking the cartridge for debris that is restricting the water flow.
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