your icing doesn’t seem to be as bad as mine and I’m thinking it needs an earlier defrost, perhaps there is a timer on it thats set too long, possibly the default setting because the installers just fitted and ran. Samsung thought too much ice but says the pump looks for several paramaters before starting a defrost.
@transparent same company but I await a reply regarding this remedial work and the manager said that the cavity was filled last November why have I left it so long. Did he expect me to do a survey on the work, I only just noticed it because folk on here raised concerns regarding pipe work so I went under house and noticed it.
I was given a 7 year warranty on the heat pump because they are samsung registered geez you wouldn’t think so. I wonder what samsung thinks.
the manager said that the cavity was filled last November why have I left it so long.
I can't find that exclusion clause in the Consumer Rights Act!
That's only 5 months ago, anyway. That doesn't sound an abnormally long interval before reporting a fault covered by guarantee.
Depending on the type of cavity insulation being used...
slots where the filler could potentially 'leak out' are first fitted with brush-strip. Air-vents are an obvious example
the manufacturer's certification process requires the installer to check for possible leaks before the documentation is signed off. Commonly, insulation beads inserted into a cavity under pressure can rise up past the wall-plate and into the soffit or attic space
One thing that may need to be checked is that any of the temperature sensors inside the heat pump have not become loose and are therefore not operating correctly.
I believe that the heat pump has a temperature sensor on the discharge pipework from the evaporator, which senses the reduction in refrigerant gas temperature as the evaporator starts to ice up. When the temperature falls to a predetermined value the defrost cycle will be initiated. If this temperature sensor is not making good thermal contact with the pipework, the defrost cycle may therefore be delayed, thereby causing a greater build-up of ice on the evaporator coils.
@derek-m will get them to explore all these issues, it must be something simple. Surely the unit shouldn’t ice up to the point it won’t work before de- icing. I have a camera there will see if I can turn it to watch it during the night.
@david999 Looks very similar to the back of my Daikin ASHP and is the OAT sensor, it is away from the body to provide air flow and thus senses the OAT more accurately than if touching the body of the pump. Regards, Toodles
Toodles, 76 years young and hoping to see 100 and make some ROI on my renewable energy investment!
@derek-m interesting video. Stateside the defrost mode in A2A systems enables direct electric heating of the incoming air to avoid loss of heating function. Having got rather fed up over two winters with my A2W system doing exactly that - losing heating function during defrost, I've just enabled the 3kW immersion back-up heater on my system LLH, which was never wired up properly at install, or commissioned. Supplementary back-up heating will enable 3kW of direct electric heating during defrost if the LWT is below 38degC. I'm hoping it will help maintain target LWT during periods of regular defrost, and mitigate the time the ASHPs needs to reach LWT after defrost, but I may need to wait until next winter now to determine that. 😉
