![background image](http://html1.mh-extra.com/html/midea/rsj-420-pzn1-h/rsj-420-pzn1-h_technical-manual_1791198049.webp)
Midea R410A Direct Heating Commercial Heat Pump 50Hz Technical Manual MCAC-HTSM-201506
49
No.
Error
code
Reason
1
E1
Power phase sequence error.
2
E2
Communication error of host unit and wired controller, main unit and slave unit.
3
E3
Error of water outlet temperature sensor (T1).
4
E4
Error of water temperature sensor in the water tank (only host unit displays) (T5).
5
E5
Error of air heat-exchanger temperature sensor (T3).
6
E6
Error of outdoor ambient temperature sensor (T4)
7
E7
Error of E-heater pipe temperature sensor (T6, reserved).
8
E8
Error of circulating water flow detector (Only host unit displays).
9
E9
Error of suction temperature sensor (Th).
10
Ed
Error of water inlet temperature sensor (T7).
11
EA
Error of discharge temperature sensor (Tp).
12
EE
Error of EEprom
13
P0
System low pressure protection
14
P1
System high pressure protection
15
P2
Compressor current of system is overload (Protection)
16
P4
Protection for discharge Hi-temperature (Tp
≥115ºC)
17
P7
Host unit is not matched with wired controller, host unit will display P7, and wired
controller will display E2.
18
P8
Water outlet Hi-temperature protection. (
≥68ºC, and keep 2 minutes)
19
C1
Compressor current is less than 2A during operation.
20
db
Anti-freezing function
21
d8
ON/OFF signal is ON close status.
22
Hb
Address conflict error.
Continuous come out any error for 4 times within 2 hours, then the unit will stop running. At the
same time, it will be counted as once. After 1 hour, the unit will be automatically running again.
If the stop frequency reaches 5 times, the protection code will be displayed and the unit should
be repowered on again.
When the unit satisfies the unit stopping conditions, the counting of stop frequency will be