checking hvac thermostat
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Is your Lennox RTU, Carrier or York not functioning correctly?

Is your RTU HVAC keeping you in the cold? While there are many rooftop hvac units (RTU) on the market, some of the most common today are Carrier, York, and Lennox units. In this post, I will discuss some very basic things to check before calling out a service provider in the event that you find your HVAC unit not working.

Check your thermostat’s battery

Is the thermostat display screen blank or battery low indication flashing? If the battery low indicator is flashing, replace the batteries and see if the RTU starts up. If the screen is blank and the thermostat does not require batteries to function, check to ensure you don’t have tripped breakers in your electrical panel. If you find a tripped breaker, try and reset it – if it trips immediately do not attempt to reset again as it’s more than likely that you have an issue that needs to be addressed by a qualified technician.

Check your thermostat’s mode

Is the thermostat calling for heating or cooling? Generally, thermostats will say if they are in HEAT or COOL mode on the display screen. Does your thermostat switch automatically from HEAT to COOL – known as an AUTO CHANGEOVER thermostat – or do you need to manually change it? Check to ensure the thermostat is in the correct mode. If it isn’t, switch it over and see if the unit starts to function. If it does not, be sure to check for tripped breakers. If you find tripped breaker, do not reset more than once.

Check the weather

How is the weather at your location? Currently in Calgary, we are experiencing a cold snap and are seeing temperatures of -32 degrees Celsius. At extreme cold or hot temperatures, check to ensure all doors and windows are kept closed. It may be hard for the RTU to maintain a consistent target temperature if outdoor temperatures are affecting its designed operation.

Is your RTU still functioning incorrectly?

These few simple things will only take minutes to check but may save you a costly service call. If none of the above can solve the problem, it is time to call in a qualified HVAC service technician. We at Icemasters would love to assist you in repairs to your HVAC system, please feel free to contact us.

We also have an easy-to-follow checklist that will help you maintain your HVAC system, keep your repair needs in check, and help your equipment last longer.

Download the HVAC Checklist

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