My 20 year old Waterfurnace Premier AT two speed heat pump switched from normal heating, reverting to Emergency heat with the resistive elements. [[ I will use WF = Waterfurnace ]] The thermostat indicated a continuously on "Fault" light and the HP showed a flashing "Low Pressure" - the owner manual suggested trying a reset. I did that twice, once by also shutting off power at the circuit breakers. The HP returned to normal operation for a couple of minutes, long enough for me to "ear check" and I found the compressor to be running smoothly as were the two loop pumps. Then the system again failed to the same condition indicators. The OM suggests a "refrigerant leak". This would have resulted in me contacting the contractor who installed the HP, but he has long since changed from Water Furnace to another brand, and then a few years ago seems to have retired, and his business along with him. I have use a WF Geopro located in the same area as my original dealer (about 25 miles from home) with mixed results. The last of two times I hired his services for was in July 2010 when he replaced my loop pumps (this job was not done correctly - my full analysis suggested that the pumps didn't need replacing either, but at least I have new pumps). The first repair on the WF was done by the same Geopro in 2009 and I experienced some delays because of parts problems with the factory (or the dealer), the forced air 3 speed fan. The repair was done correctly and is still operating in good order. That business also has vanished. This could be related to the problems I had with that business on the second visit... I settled my complaint with the owner and did not escalate - in fact this is my first public complaint and is provided only to explain my caution in calling a new repair service - see below. So, as I am not in an emergency, just paying the high cost of resistive heating reduced by using a wood stove insert, I am shopping for a repair service. There is a WF Geopro about 20 miles from me that appears to be a dedicated geothermal dealer and several (new to me) WF dealers within 10 miles of me. But, as my unit is old I am leaning toward contacting the more distant Geopro for a repair visit. I have also sent email to that dealer and to the WF Territory Manage asking for advice on getting local help on my older unit. I have not yet heard back and will telephone the TM later today. Welcome comments.... I will also discuss replacing the compressor (would like to replace with a Scroll) and other major updates (upgrades if possible) as well as replacing the system with a newer Synergy system. Cost will be a major decision factor. Well insulated 2000 sf home and 20 years experience with a 4 ton (36 KBTU?) geothermal hp. So I have a mind set to reuse the existing ground loop (vertical) and same size hp.