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Hey everyone I got a service call for a Navien combi boiler...the problem the customer was having was no hot water at all....when I got to call I immemediatsky called Navien tech support...they told me that the flow sensor in the domestic hot water inlet was not sensing they told me to remove the sensor and check to see if it was dirty?....the sensor look like a tiny pump impeller....I checked sensor all looked good...the Navien does work when I hook a hose to the domestic hot water outlet....it does not work when I open any faucet or even the tub spout....I believe the unit turns on once it senses 0.5 GPM flowing through the DHW side....I tried getting Navien to send me a New sensor but they said it works?? Ours under warranty....had anyone experienced these type of issues with this boiler? Thanks Paul S