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Last seen: Oct 25, 2026
@jamespa I have not been in that area before, not my area of comfort, (don't like playing in case I break something. Will have a look.
Heating only just going on today (4:30pm), been off since last night (my intervention as we are too hot). Outside it's 13C here. Only reason for putt...
I have been writing down the temperatures on the probes on top of the buffer. High Point just prior to Defrost Cycle Two - 28.8C (significant drop...
Twi (Temperature Water In) is Hitachi's term for water returning to the Heat Exchanger. Remember, my temperature sensor are not metal probe...
This is the manifold. Zoom in to see actuators are removed.
The secondary pump runs all the time when there is a demand for heating and when in the Thermo Off situation. Yes the power cut turned the heat pump...
JamesPa. Data for the 26 November -4C OAT during night. 11C OAT during latter day. Water Temperature FIXED @ 31C. This temperature is a litt...
JamesPa I plan to send you a chart tomorrow of todays (26th) result. Just to make sure I am giving you what data you need.
I wish I had only 9 defrosts in that timeframe. I had 16 in the early morning of just the 26 Nov.
Sim0n0. I also have the Hitachi Yutaki system. Also having lots of problems.
Thank you for the reply. I think you are saying that what I am seeing is normal (Evaporator -23C. OAT -4C. Defrost cycle every 46 minutes). ...
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