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[#1] 日立分体冷氣問題    
近日部2匹分体變頻冷氣開始唔夠凍,發覺壓縮機運作由大聲變到好細聲,是否漏雪種或其他機件固障?已自行清潔過室内外機,大家有冇類似經驗,謝謝。
vin7289
個人訊息 會員
203.xxx.xxx.79
2020-09-20 04:15
[#2] 日立分体冷氣問題    
Recently, I watched a few footage on troubleshooting inverter type AC. (fixed speed is becoming obsolete) Would need to check various test points for resistance(solid state board, MOSFET), voltage(dc link, input ac, CPU input), sensor values(got 2-3 for outdoor unit), compressor current before jumping to conclusion. The problem is, technician in Mainland would check and repair down to component level hence low repair cost, but not HK one.(only swop the board at high cost)

Also, check for error signal or flash light.

最後修改時間: 2020-09-20 08:23:20
alexanderkoo
個人訊息 正式會員
223.xxx.xxx.142
2020-09-20 08:22
[#3] 日立分体冷氣問題    
thanks for your reply.
vin7289
個人訊息 會員
203.xxx.xxx.79
2020-09-20 08:53
[#4] 日立分体冷氣問題    
Usually check the electronics first, if fortunate, only temp sensor problem. Checking refrigerant pressure is not accurate since compressor running at low speed. Do so at a later time.
alexanderkoo
個人訊息 正式會員
223.xxx.xxx.142
2020-09-20 09:01
[#5] 日立分体冷氣問題    
thanks you again.
vin7289
個人訊息 會員
203.xxx.xxx.79
2020-09-20 11:14
[#6] 日立分体冷氣問題    
咁運作聲由大變細,只要一樣咁凍,其實係好事嚟喎?

我部日立分體都有一個奇怪地方:唔知點解個隔塵網唔多會污糟,每次檢查都好似冇乜塵喺上面,另外幾部窗口機就好快污糟。

最後修改時間: 2020-09-20 11:24:24
bankguy
個人訊息 會員
199.xxx.xxx.183
2020-09-20 11:17
[#7] 日立分体冷氣問題    
>> 唔知點解個隔塵網唔多會污糟,每次檢查都好似冇乜塵喺上面,


你試吓用電筒照吓出風的豬籠扇,啲塵應該一舊一舊係扇葉度。
AndyTKO
個人訊息 會員
14.xxx.xxx.178
2020-09-20 15:32
[#8] 日立分体冷氣問題    
已清洗過豬籠,室內,室外機,可能是電子部分有問題。謝謝各位。
vin7289
個人訊息 會員
124.xxx.xxx.66
2020-09-20 15:52
[#9] 日立分体冷氣問題    
大金也有出現

是室外电子板衰左
phil.ng
個人訊息 會員
223.xxx.xxx.7
2020-09-20 16:08
[#10] 日立分体冷氣問題    
[#7] 相信唔會,幾個月前搵人洗過。
bankguy
個人訊息 會員
199.xxx.xxx.183
2020-09-20 22:24
[#11] 日立分体冷氣問題    
用手摸吓個冷coil上下同左右冷度是否一致,如果吾一致就大幾會漏種
至於電子問題自己較難解決,至少要識用鉗錶同雪種錶先做到檢查
kawainet
個人訊息 正式會員
61.xxx.xxx.178
2020-09-21 00:10
[#12] 日立分体冷氣問題    
If there's good reason to believe that there's refrigerant leakage, stop the ac. There were incidents when compressed refrigerant in high conc, sucking air and spark(3 criteria) causing explosion. More dangerous than R22. R32 is the worst.

For more "normal" ac, measure refrigerant pressure 10 bar when running. (Lower than non operating of 20 bar) Hence less chance of frostbite and refrigerant escaping during gauging. There is external safety valve(got this, inexpensive) but not commonly used.

Two different circumstances.

最後修改時間: 2020-09-21 05:45:26
alexanderkoo
個人訊息 正式會員
218.xxx.xxx.252
2020-09-21 05:38
[#13] 日立分体冷氣問題    
will call C Fu to check the electronic parts, thank you all again.
vin7289
個人訊息 會員
165.xxx.xxx.212
2020-09-21 10:17
[#14] 日立分体冷氣問題    
你會見C FU 、冇料到丶直頭吾識check 每位的check point, 都不知是什麼丶叫換板算數!

你吾好失望

最後修改時間: 2020-09-21 11:20:24
phil.ng
個人訊息 會員
223.xxx.xxx.7
2020-09-21 11:19
[#15] 日立分体冷氣問題    
even the C fu is yau 料到, dealer company policy may be - change the board

and those board may be fixed at the backend, suppose to be quite easy as they have all the test point data, and then that reconditioned board will be used for other repair order etc .suppose it is a term from the dealer, the replacement board may not be "new" too


suppose some non dealer C fu may have such services, and even he found out the issue, then he may suggest u to buy a board from china for lesser risk etc.. ( many of the cases, such board is available for rmb 600 etc.. then charge u first visit fee at hkd400, second visit is rmb 600 + another hkd400 etc..

it is very likely those management at the dealer may make such decision

最後修改時間: 2020-09-21 11:58:28
hahayanyan
個人訊息 會員
45.xxx.xxx.74
2020-09-21 11:49
[#16] 日立分体冷氣問題    
80% swopping board for checking, A/B substitution, fast, earning more money. 10% on temp device (but now,not exactly stopping but only at lower speed)10% on communication link. Watch a few troubleshooting footage, most of the time, needed to replace board.(cpu problem)

Years ago, had a National split unit, unable to change to warming mode. C-fu could not repair it, sensor problem.
https://acerrorcode.com/hitachi-air-conditioning-error-codes.html

最後修改時間: 2020-09-21 14:10:12
alexanderkoo
個人訊息 正式會員
223.xxx.xxx.184
2020-09-21 13:54
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