I have a Amana PTH123A35AC heatpump. A while back I replaced the Dual Function Heat Limit Switch as required. It worked fine thruough Winter. Now when I attempt to use the system it has no power indicator light. The outlet has power but the unit won't come on? Any suggestions?

This weekend I tried replacing my old manual thermostat with a new "digital unit". When the hook-up was complete I turned on the auto switch and the inside blower fan unit came on for about 30 seconds then quit completely. Never could get it to come back on so I removed the new thermostat and put the old one back on and still nothing from the inside blower fan in either mode....cool, heat, em/aux heat, auto or on. It's almost like the unit isn't receiving any power. Circuit breakers are not tripped and I replaced the 30 amp fuses at the unit outside the house. I looked inside the the blower unit inside the house and didn't see any fuses or "reset buttons"...not to say there isn't any but I couldn't see any. Is there any reset buttons on the inside or outside unit?.. Or any suggestions as to what might be wrong ? Any help would be greatly appreciated.