I have a Navien combo unit that was installed 3 years ago and has been running fine with no issues. For the past few days the temp on the thermostat has been set to 75 but reading at 65. I changed the batteries in the thermostat for good measure. The baseboard is freezing cold. Boiler is running constantly with no error codes. The display shows the "radiator heat" sign and temps as usual. I'm a single mom with not very much knowledge of this kind of stuff so i apologize in advance.
Looking forward to hearing from you. Thank you.
Looking forward to hearing from you. Thank you.