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Last seen: Jan 12, 2025
Hi Derek, What a result!!............Changed the pump connector to CNP4 and pump no longer runs unless required by DHW call for heat.........proved i...
@DerekM Hi Derek, I have not yet tried swapping the DHW pump connection over although as you have said and from looking through all online manuals...
@derek-m Thanks for your advice Derek.....my system is out of warranty with the installer so I think I will come clean and let them know I have fou...
@harriup The wiring is not correct and the DHW pump is running all the time the primary pump is running....see latest post to @derekm I only run t...
Hi Derek, Been back up in the loft (Big mistake that was)! , and traced cables from pumps to the FTC board As we suspected the FTC is not wired a...
Hi Derek....no wonder you were not at your peak with the amount of input you contribute to the forums. Your assumption of my query could be correct ...
Agree it looks a bit like a rat's nest!! I think I differ in that I have an external plate heat exchanger (not the internal coil )and the dedicated ...
Derek....if you zoom in I think the model no's can be seen but I can clarify the auto pump is UPM3 Auto L(think this is the heating circuit pump)........
The unit came all prewired and plumbed from Mitsubishi so it sounds like it has to be as you have said...I think I will give mitsubishi a call on this...
Hi Derek, Photos as requested, the pump without any obvious manual control is the one adjacent to the one with LED display(the one that data sheets ...
@Sun&Air...thanks for your comments......a lot of water has passed under the bridge since I posted back on page 5 so things have got a bit disjoi...
@derekm and everyone else 😄 I said that I would investigate in more detail what is happening with my full mitsubishi packaged system pumps and have ...
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Degrees of Separation
Latest Posts
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RE: Why don't people choose heat pumps?
By the same measure we should be insisting that all gas...
By Batpred , 2 hours ago
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RE: How quickly would you want/expect heat recovery to take from setback?
True but .. because the room is colder dt rad to room i...
By JamesPa , 2 hours ago
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Got two or three heat pump quotes that don’t agree? Post them here.
One of the biggest sources of confusion I see on Renewa...
By Mars , 2 hours ago
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RE: Load Shift and Lifestyle Shift Complete - our journey has ended, for now
I do not disagree with the concept of wanting to live a...
By Batpred , 2 hours ago
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RE: Buffer tank on a 2 x 14kw Ecodan system
@singlespeed I am going to put a temperature sensor on ...
By fosterl2 , 4 hours ago
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RE: Grant Aerona - Weather Compensation and Schedules
@taffonthetaff Yes, I have now gotten to the bottom of ...
By bontwoody , 5 hours ago
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RE: Grant R290 DHW Cycle Interuption
Occasionally our Grant R290 activates all three circuit...
By TaffontheTaff , 5 hours ago
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RE: Peak Energy Products V therm 16kW unit heat pump not reaching flow temperature
@davec 47kwh for 3 days is very low, compared to what I...
By johnd , 7 hours ago
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RE: Our 10 year old Grant heat pump failed
As I understand it it was working then stopped. More l...
By JamesPa , 11 hours ago
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@pipcart, Wattson is back... please go to the homepage ...
By Mars , 11 hours ago
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Do heat pump defrost cycles impair heat pump efficiency (COP values)?
The short answer is no, as far as I can see from data f...
By cathodeRay , 11 hours ago
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RE: Are We Sleepwalking Into Another Race to the Bottom?
That is a good approach and an excellent result. For co...
By Judith , 1 day ago
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