After some further research and fault finding, I discovered that my problem with the E912 error wasn't to do with a sticky relay. I had purchased a Grundfos UPM3 AUTO pump because the Samsung ASHP can use a communication signal called PWM (Pulse Width Modulation) to talk directly with the pump and modulate its output very accurately depending on conditions. The problem I had was that this pump doesnt actually support PWM. In my defence, it has the communications plug socket for it and other pumps in the same range do support it, but mine didn't! To get my pump to work properly, I had to change its connections in the Samsung control unit from 1 and 6 to 7 and 8, remove the PWM lead and change a setting in the controller's FSV values. This was value 4051 which should be set to 0 (Not Used). Once I had done this, the error disappeared and the pump turned off when it should :-)
The dilemma now was whether to just suck up the fact I had made a mistake and live with it, or shell out another £100, get the correct pump and put the old one on ebay!
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AuthorEx Radiographer, Information Analyst, Teacher and Self-builder. Now retired Archives
December 2023
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