Spring Cleaning: The Importance of Spring Maintenance
It is very important this time of year for spring maintenance for the air conditioning system.Proper annual maintenance will help…
Author: Jonathon Pullen
Technical Services Manager
Gulf Coast District
Diagnosing and Fixing Fault Code 44 on FE4 or FE5 Infinity Evolution Fan Coils
Have you ever had a fault code 44 on a FE4 or FE5 infinity or evolution fan coil? Do you…
The new Carrier 27VPA9
This new unit is a noncommunicating variable 5 speed performance line heat pump with InteliSense technology, 19 seer2. Sizes range…
Troubleshooting Codes 25-XX
Have you worked on the new 20, 21, and 23 SEER2 units and encountered a fault code 25-XX (for example,…
38MU/40MU Crossover System
In this article, I will explain how to wire the new crossover system for 24V communication or scenario 3 using…
Overheated Thermostat
Have you ever run across an overheating thermostat? Where the thermostat displayed 90 and the room temp was in the…
38MU/40MU 18/8 Low Voltage Wiring
This month, I will be covering how to properly wire a 38MU/40MU for 24V operations and setting up the DIP…
Late Friday Night
It’s late one Friday night and you are on a call with a bad OFM (outdoor fan motor). The OFM…
DUCKT-STRIP Wiring
DUCKT-STRIP wire is a great product for ductless units when used properly. The wire is used to power and communicate…
Adaptive Heat
If you have a 2-stage performance furnace, you have a heat mode called adaptive heat. Adaptive heat can be controlled…
