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FOR INSTALLERS AND PROFESSIONALS
4. FAILURE CODE
NO. DISPLAY NOT FAILUREDESCRIPTION
1 E3 No water protection
2 E5 Power supply excesses operation range
3 E6
Excessive temp difference between inlet and outlet water (Insufcient water ow
protection)
4 Eb Ambient temperature too high or too low protection
5 Ed Anti-freezing reminder
6 OFF Customer Control Switch DIN2 Disconnect
NO. Display Failure description
1 E1 High pressure protection
2 E2 Low pressure protection
3 E4 Phases lack protection (three phase model only)
4 E7 Water outlet temp too high or too low protection
5 E8 High exhaust temp protection
6 EA Evaporator overheat protection (only at cooling mode)
7 P0 Controller communication failure
8 P1 Water inlet temp sensor failure
9 P2 Water outlet temp sensor failure
10 P3 Gas exhaust temp sensor failure
11 P4 Heating (Evaporator) coil pipe temp sensor
12 P5 Gas return temp sensor failure
13 P6 Cooling (Titanium heat exchanger) coil pipe temp sensor
14 P7 Ambient temp sensor failure
15 P8 Cooling plate sensor failure
16 P9 Current sensor failure
17 PA Restart memory failure
18 F1 Compressor drive module failure
19 F2 PFC module failure
20 F3 Compressor start failure
21 F4 Compressor running failure
22 F5 Inverter board over current protection
23 F6 Inverter board overheat protection
24 F7 Current protection
25 F8 Cooling plate overheat protection
26 F9 Fan motor failure
27 Fb Capacitor no charging protection
28 FA PFC module over current protection
29 8888 Communication failure
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