MJW!
New Member
Navien 240a2 posts at 73 degrees, sudden occurence with no error code. Replaced PC Board and /flow sensor assembly with moderate increase in temperature. Could Display module be bad?
Navien 240a2 won't produce more than 73 degrees
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Fitter30
Well-Known Member
When the last time the heat exchanger was cleaned with vinegar? What does the flow rate read? Current beat capacity Page 85
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Setting The Weekly Schedule; Viewing Basic Information - Navien NPE-180A2 Installation Manual [Page 86]
Navien NPE-180A2 Manual Online: setting the weekly schedule, Viewing Basic Information. When Setting Up The Weekly Option, Select Weekly, And Select 1 Day, 3 Day, Or 7 Day To Go To The Schedule Menu. Working ( 00:00 - 01:00, 12:00 - 13:00) Press The Up Button ( To Choose The Scheduled...
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John Gayewski
In the Trades
Check valve? Have you replaced it?
GReynolds929
Active Member
This. The check valve is the most likely culprit. Try setting the two way valve to external and see if the output gets to temp. You can also monitor the heat exchanger outlet temp in the settings to make sure it is heating to temp properly. Like @Fitter30 said if it is more than a year old it needs descaled.
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