You have to be sure you are getting 24vac to the white wire from the thermostat. Put thermostat up more than 5 or 6 degrees higher than the room temperature and then check at the unit to see if you have 24v from W to C. If you have 15 or 20kw of heat, you should also have 24v on the brown or W2 to C. If you do not, and you do have them wired at the thermostat, there is a problem with the stat. Either it is not set up in the advanced parameters for aux heat, or it is just bad. If you do have 24 on W and or W2, then you have to check the sequencers in the HK heat kit. Use an amp clamp to see if any of them are actually pulling amps. Then, check to see if you are getting power to the sequencers...that would be 24v between the blue and white on sequencer 1 and between brown and white if you have a second sequencer. If you do and the elements are not pulling amps, you have to determine if the sequencer is closing or if the element, thermal limit or fuse link is bad.
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You have to be sure you are getting 24vac to the white wire from the thermostat. Put thermostat up more than 5 or 6 degrees higher than the room temperature and then check at the unit to see if you have 24v from W to C. If you have 15 or 20kw of heat, you should also have 24v on the brown or W2 to C. If you do not, and you do have them wired at the thermostat, there is a problem with the stat. Either it is not set up in the advanced parameters for aux heat, or it is just bad. If you do have 24 on W and or W2, then you have to check the sequencers in the HK heat kit. Use an amp clamp to see if any of them are actually pulling amps. Then, check to see if you are getting power to the sequencers...that would be 24v between the blue and white on sequencer 1 and between brown and white if you have a second sequencer. If you do and the elements are not pulling amps, you have to determine if the sequencer is closing or if the element, thermal limit or fuse link is bad.