I've done some plumbing and electrical work in the last few days, and got them working again. Perhaps they can be brought back into use.
1. I removed a check valve to improve flow through the heat exchanger (that works). I put it there to stop 'improper' flow when the more powerful flow from the heat pump is working, but this risk no longer applies.
2. Modified the wiring so that I can force the pump to come on (so that I can check flow rate and working action) - partly done, right->
3. Refilled the system on both sides of the exchanger with fresh liquid so that it can run - and gradually work the airlocks out. I don't have an airlock remover at the highest point of the tubes circuit, but regular pumping around does seem to remove them gradually. I need a sunny day with both pumps working to be sure it works.
By the end of the day, I had a new reading on the energy meter!! Looking at it working now, I wonder why it seemed so difficult before!
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