Question about Taco SR503-4 3 Zone Switching Relay

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Navien combi boiler

Randomly runs of of hot water. Shower for 5--7 minutes with hot water than goes completely cold. Turn off water. Wait 3 minutes or so. Hot water is back. Does not happen every shower. Sometimes happens at kitchen faucet after less than a minute of hot water.

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  • 21 Answers

Call in a plumber. it sounds like it is malfunctioning.

Posted on Mar 18, 2014

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The hot water will fluctuate accordingly to the time of year as the cold water temp coming into the property will vary. but the boiler will modulate to compensate.So in brief in the summer you will notice it hotter than you would in the winter, this has nothing to do with the boiler just the incoming temp of the cold water.

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Have a combi boiler and the hot water from my taps are running cold to luke warm. My British Gas engineer has told me it is nothing to do with the boiler but is caused by a faulty thermostat cartridge in...


Modern shower valves have an "anti scald device" in them to prevent scalding from to hot water.

They come preset at 120 degrees.

Sometimes they can start to malfunction and all you get is warm, not hot water, they can also be intermittent.

This will only effect the shower valve though, not the other faucets.

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