I have an aquacal heat pump 120AHDEWNB
S/N 1052685D05. Circa 2004/2005. After a successful opening this year (complete with compressor start), the display goes blank after a few hours of running (but fan continues to run...cant tell if compressor is running as light is not displayed) If i pull power at the fuse/wait a few minutes and restart. All display features work and compressor starts after the waiting period...what can i do to fix/confirm it is running