1

Check that the HVAC unit is plugged into it's power source and if applicable that the external power switch for the HVAC unit is turned on

Some HVAC units may have an external power switch that is on the unit or somewhere within the room

2

Check that the HVAC unit is receiving power from it's power source

Even though the unit is connected to it's power source it may not actually be receiving power from that source

3

Check that the HVAC Controller Gateway is plugged/screwed into the HVAC unit appropriately

Some HVAC units require that the HVAC Controller Gateway be plugged in and some require them to it be screwed in. Use the below link find the appropriate PTAC or VTAC Configuration Guide for the make and model of HVAC unit that you are working on and confirm that the unit is plugged or screwed in appropriately

PTAC & VTAC Configuration Guides

4

Check that the HVAC Controller Gateway is receiving power from the HVAC Unit

This can be checked by looking at the green LED at the bottom of the HVAC Controller Gateway. This is located inside the small hole next to the pin header connections. Below are the possibilities of how the light could appear

• No light present - Confirm that steps 1 through 3 of this guide have been completed. If each step is verified then it is possible that the HVAC Controller Gateway is damaged and needs replaced. This can be tested by hooking up a new HVAC Controller Gateway to the HVAC unit. If the new HVAC Controller Gateway powers up then the old one is bad, and if it doesn't power up then the issue lies somewhere between steps 1 and 3

• Light on and flashing at the same rapid interval - This could mean that the HVAC unit is not outputting the appropriate 24V power from it's remote thermostat interface or the HVAC Controller is damaged. This can be tested by hooking up a new HVAC Controller to the HVAC unit. If the new HVAC controller flashes in the same manner then it is very likely an issue with the HVAC unit and the unit needs to be repaired/replaced. If the new HVAC Controller Gateway doesn't flash in this manner then it is very likely the old HVAC Controller Gateway is damaged and needs to be physically and digitally replaced with the new unit. Follow this guide to install only a new unit HVAC Controller Gateway Only Installation Manual

• Light on and staying solid - Good working condition

• Light on and flashing at random intervals - Good working condition