Arrived to thermostat blank, checked for 120v at the indoor unit had 120v. Confirmed 120v going into the transformer however when I checked the 24v side I was getting 0v this means the Transformer had failed and was not converting 120v to 24v. Offered homeowner a new transformer a surge protector and a DCM1 she approved the repairs. Replaced transformer and tested system, system started and is heating currently. Added surge protector wired in parallel per instructions. Will need to return to perform maintenance on system. System is operating at this time.