Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Lochinvar Noble "COMBI SENSOR FAULT"
I have a Lochinvar Noble combi boiler installed about 5 years ago by a professional who has since passed away.
The unit displays COMBI SENSOR FAULT.
On the main interior manifold I see the following sensors: Outlet, Out Temp, Flow, In Temp.
I see from the service manual that the Combi Sensor is connected to CN4-5 and CN4-6, and I think (not sure) that those go to the Out Temp sensor.
But, disconnecting each sensor one by one results in the display showing a different error message, like, "OUTLET SENSOR FAULT" or the in and out temps disappearing.
And, when DHW is running, the little light on the Flow sensor lights up.
I removed the flow switch and cleaned the filter, but that didn't help.
Also, I don't know the password. Not sure if that is relevant. Maybe need to manually reset the COMBI SENSOR FAULT error?
Can anyone steer me on this?
- 116K All Categories
- 82.2K THE MAIN WALL
- 2.6K A-C, Heat Pumps & Refrigeration
- 40 Biomass
- 399 Carbon Monoxide Awareness
- 1 Chimneys & Flues
- 1.5K Domestic Hot Water
- 4.2K Gas Heating
- 102 Geothermal
- 148 Indoor-Air Quality
- 2.6K Oil Heating
- 40 Pipe Deterioration
- 648 Plumbing
- 4.7K Radiant Heating
- 345 Solar
- 13K Strictly Steam
- 2.8K Thermostats and Controls
- 46 Water Quality
- 574 Buy, Sell, Barter
- 30 Industry Classes
- 62 Job Opportunities
- 11 Recall Announcements