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Author Topic: Daikin Altherma ASHP Reliability or Liability?  (Read 1307 times)
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Posts: 37

« on: November 15, 2018, 03:12:05 PM »

In 2011 I had a Daikin Altherma Monoblock ASHP installed, I was promised like everybody else cheaper heating ETC Etc.  Seemed OK at the start but the weather was milder then

Very expensive to run in temps below 10 degrees and the condenser coil froze regularly at this temp and below - this meant it defrosted itself and no heat was produced during this period


2016 Compressor failed - replacement was 1925 fitted by Daikin approved installer
2017 Fans failed and caused a processor PCB to also fail 1200 to fix
October 2018 Compressor that was replaced in 2016 has failed again

November 2018  I have bought a new Oil fuelled Grant Vortex condenser boiler and disconnected the ASHP.  The cost of the new boiler and fitting including disconnecting the ASHP was less than what a new compressor would have cost me.

I was never told of the extortionate cost of parts or the unreliability of the ASHP

Has anyone else experienced anything similar

PS All parts available (not the compressor)

Daikin 16kW Monobloc ASHP - Stovax 8kW multifuel stove
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« Reply #1 on: November 15, 2018, 03:40:42 PM »


Although we should expect equipment sold by established manufacturers to have been thoroughly tested for durability I think those of us of a certain vintage have been, very reluctantly, used to the idea that many products get tested by the public. Sometimes being a 'pioneer' is challenging (I think this regularly with my Growatt).

I was more than a little irritated that my 'new' GSHP suffered a control PCB failure but as it was within warranty it was replaced at no cost to me other than the fact the default is that the heat pump uses what is effectively the immersion heater element to do the job the compressor isn't.

I'm still only 23 months in so there is time yet for defeat to be snatched form the jaws of victory but I'm keeping my fingers crossed.



1.28kW on a Lorentz ETATRACK1000 + 1.44kW/ SB3000TL-21 (FIT), 1.28kW/ SB1700 (ROO/FIT). CTC GSi12 heat pump/Ecosol/Flowbox 8010e/Gledhill ASL0085 EHS/3off Navitron 4720AL Solar ET & Immersun T1060/T1070/T1090. 3.375kW/ SMA SB3600TL-21 and a Sunny Island 4.4M-12 c/w 15.2kWh battery and a Renault Zoe.
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« Reply #2 on: November 15, 2018, 04:54:44 PM »

My Panasonic ASHP is just starting it's 5th winter and I have had no faults as yet.
The running costs are very low and it provides our heating even in the coldest weather.
The defrost cycle is necessary for ASHP's and they all do it; otherwise the heat exchanger would just end up covered in ice and ineffective.
So far, so good, I'll keep my fingers crossed not to encounter these kind of major faults any time soon.

Schuco solar hot water - 3300kWh/annum, 16 BP 4175N PV panels - 2.8kWp, log burner and back boiler and 18 Ying Li 235 PV panels - 4.2kWp, 42kW ground mount PV, 9kW Panasonic ASHP, 40kWh Nissan Leaf
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« Reply #3 on: November 15, 2018, 05:49:12 PM »

Mitsubishi ran faultlessly for 5 years prior to move

Kidwelly South Wales
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« Reply #4 on: September 15, 2019, 09:44:38 PM »

Our daikin was also installed in 2011 and last year had control board fail in the outside unit which had to be replaced along with both fan motors, the cost was about 2000.

I will be very unhappy if something similar happens again.
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