45 MBCA Ductless Unit and the “CP” Error Code
Most ductless products have all of the error codes listed in the installation and service manuals. Error codes listed in…
Tag: Misc
Defrosting Thermostats: Learning & Understanding Heat Pumps
We have multiple articles about the defrost boards for residential and commercial units on our website and each has addressed…
Ductless Units and Compatibility Verification
There are several different types of ductless heating and cooling systems. These systems can be combined with various indoor and…
Condensation From a High Efficiency Furnace
High efficiency furnaces, also known as 90% furnaces or condensing furnaces, use two heat exchangers to remove more heat from…
Evaporator Coil Corrosion: Why Do Some Corrode Faster Than Others?
Indoor coil corrosion followed by leak failure has been an issue in the HVAC industry for a long time. Although…
48GC Package Unit & System Sensor Smoke Detector D4120 Setup
Smoke detectors can be used in many different residential and commercial applications. They can be utilized using the smoke shutdown…
Vacuum Pump Performance
Most technicians are aware of the importance of changing the oil in your vacuum pump regularly. However, if you aren’t,…
Toshiba/Carrier U-Series Installation and Troubleshooting: L11 and E17 Error Codes
Installation of a heat recovery VRF system allows multi-zone heating and cooling. A heat recovery system allows you to heat…
The Magic Is In The Change
What is superheat? What is sub-cooling? In this article we will review what refrigeration is, how it works, and some…
Why Do Systems Freeze in Cooling Mode?
When troubleshooting any issue, it is always best to start with the most probable cause and work your way to…