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Themostat problem no power

\015 I have a ruud ac/heat unit with em.heat mod.# uhqa-1015tks and therm. mod.# lr/620 and # t874r1434n. putting in a new thermo. i discoverd that there was no power to the thermo. All breakers are on.there is power to the air handler and the outdoor unit.how can i get power to the thermo?\015

Answers :

Your R terminal in your air-handler is the 24v power that goes to the tstat. Look at the air-handler and match the color wire. ALL tstats have a power wire going to them. If you aren't getting power, you probably have a break somewhere in the wiring close to the thermostat you are replacing.

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