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Recently we.had to have the motor replaced on our 3 year old Navien Combi boiler/tankless water heater because it made a squealing noise periodically. The technician who worked on it told us to let him know if the new one made the noise. Around 3 weeks later my husband noticed it making the noise again but only periodicaaly. The heating company we bought it from cannot determine what is wrong with it and basically washed their hands of it. What could be wrong? Is it another faulty motor or could there be another problem? Is this a common Navien Combi boiler problem.

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This could actually be a manufacturer issue with the brand of pump. Based on your description it is unclear if this is a circulator pump, fuel pump, zone valve motor or other motor on your appliance. As a 30 plus year technician of heating appliance I have seen many parts factory defective, especially when purchased at the same supply house. Inventory is typically shipped to supply houses with manufactured parts from the same factory lot numbers, and when this happens, the technician keeps replacing a part with parts from the same bad lot!

Also, not knowing the true details of this situation, the installation set up, piping sizes, component brands, what means of air venting system was used in the hydronic side of this system, if any? With that said giving you a more specific answer is really impossible, based on the little knowledge I have to go on to help you out.

My recommendation would be to contact another company and have them come out to look at the problem, if you find the previous company charged you for parts that were not needed or the system was installed incorrectly, contact your local plumbing inspector for what to do in your area.

Posted on Dec 13, 2014

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Posted on Jan 02, 2017

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SOURCE: vaillant 831 combi boiler timer help

check to see the time clock is set with the clock symbol. there are three settings on analog clocks I , O and clock the I setting is constant running, the O setting is off and the clock setting is timer.
also try setting the thermostat up higher to see if the boiler fires.

Posted on Mar 30, 2009

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SOURCE: noisy water heater blower

It may just need a new pump coupling. Fairly inexpensive. I don't think you need to replace the whole burner.

Posted on Apr 24, 2009

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SOURCE: noisy water heater blower

yes the bearing could be gong bad, the screws could be comming loose which could make it where out the motor faster, it should be attended to

Posted on Jun 06, 2009

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SOURCE: Worcester combi boiler losing pressure & water through o/flow

having the same problem and its a new bolier. thanks , adriano.

Posted on Jul 12, 2009

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