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Hi IN#39’m Austin bloom today is our continuing discussion on communication errors now we will begin inserting common errors that we see every daylong with the communication error knowing what the communicating DC voltages can greatly help in troubleshooting the system I have set this unit up to display a communication error due to having zero volts DC two causes for this either could be grounded s3 wire or a faulty outdoor board the first step is to check DC voltage at the s2 and s3 terminals anyone#39’ll see we are getting zero volts DC the easiest way to tell if s3 were grounded is to first check your s2 ands3 DC voltage and verify you are getting0 volt DC then after turning off the power remove all three wires from the outdoor unit as we#39’ve done here check your s3 wire to ground with your own meter now with the power back on also check to see if with the wires removed you regain a steady 24 volts DC at thes2 and s3 terminal block of the outdoor unit if you find a grounded s3 wire with the wires off, and you regain your 24volts DC at the outdoor terminal blocks2 and s3 repairing your wire would solve your issue having zero volts DC ats2 and s3 could indicate a bad outdoor board you can verify this by checking your s2 and s3 DC voltages and making sure that they are a zero volts DC then remove all three wires with the power off at the outdoor unit once power is turn back on recheck your DC voltage at the outdoor unit terminal block you should read 24 volts DC if zero volts DCI read check the control boards tonsure you#39’re getting the correct Dunbar voltage you can find where the check the DC bus bar voltage on your particular model number by checking out the service manual and looking at the test point diagram these manuals are made available to you at no cost at my link drive calm you
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