Hey all,
My home has a Navien NCB-240E NG tankless water hater. After not having the system serviced or cleaned for a solid 5 years (I know -- not good), we recently had it done per recommendation of our plumber. They replaced the ignitor, cleaned the air inlet screen, replaced the filter, and descaled the system. Ever since then, it seems that my shower cannot maintain hot water and has made it significantly more frustrating to use. Interestingly, if I have a faucet running hot water at the same time, I have no issues losing hot water in the shower (I think this makes sense given the faucet is triggering the DHW demand). I went to the info display of the system to check the DHW flow rate and with only a sink running at its hottest setting, this fluctuates between 1.0-1.2 GPM but provides hot water for any duration of time at the sink seemingly without an issue. However with the shower set to a normal warm water temp, this shows 0.6-0.8GPM and after a minute or two drops to 0.0GPM causing the heating process to stop and the shower becomes cold. It doesn't seem to recover from this unless I set the shower to its maximum temperature which will then trigger the heating process once again until I lower the shower back to its warm setting. I want to suspect this could be an issue with the flow sensor, but I am still a bit confused how any routine service could've caused such an issue (unless its simply comes down to bad timing).
(I should note that I am not a plumber by any means)
I'd be interested to hear your thoughts,
Thanks!
My home has a Navien NCB-240E NG tankless water hater. After not having the system serviced or cleaned for a solid 5 years (I know -- not good), we recently had it done per recommendation of our plumber. They replaced the ignitor, cleaned the air inlet screen, replaced the filter, and descaled the system. Ever since then, it seems that my shower cannot maintain hot water and has made it significantly more frustrating to use. Interestingly, if I have a faucet running hot water at the same time, I have no issues losing hot water in the shower (I think this makes sense given the faucet is triggering the DHW demand). I went to the info display of the system to check the DHW flow rate and with only a sink running at its hottest setting, this fluctuates between 1.0-1.2 GPM but provides hot water for any duration of time at the sink seemingly without an issue. However with the shower set to a normal warm water temp, this shows 0.6-0.8GPM and after a minute or two drops to 0.0GPM causing the heating process to stop and the shower becomes cold. It doesn't seem to recover from this unless I set the shower to its maximum temperature which will then trigger the heating process once again until I lower the shower back to its warm setting. I want to suspect this could be an issue with the flow sensor, but I am still a bit confused how any routine service could've caused such an issue (unless its simply comes down to bad timing).
(I should note that I am not a plumber by any means)
I'd be interested to hear your thoughts,
Thanks!