Rheem RPH Series User Manual page 21

Protection & Failure codes
NO. Display
1 E3
2 E5
3 E6
4 Eb
5 Ed
NO. Display
1 E1
2 E2
3 E4
4 E7
5 E8
6 EA
7 P0
8 P1
9 P2
10 P3
11 P4
12 P5
13 P6
14 P7
15 P8
16 P9
17 PA
18 F1
19 F2
20 F3
21 F4
22 F5
23 F6
24 F7
25 F8
26 F9
27 Fb
28
FA
Protection code description
No water protection
Power supply excesses operation range
Excessive temp difference between inlet and outlet water(Insufficient
water flow protection)
Ambient temperature too high or too low protection
Anti-freezing reminder
Failure code description
High pressure protection
Low pressure protection
3 phase sequence protection (three phase only)
Water outlet temp too high or too low protection
High exhaust temp protection
Evaporator overheat protection (only in cooling mode)
Controller communication failure
Water inlet temp sensor failure
Water outlet temp sensor failure
Gas exhaust temp sensor failure
Evaporator coil pipe temp sensor failure
Gas return temp sensor failure
Cooling coil pipe temp sensor failure
Ambient temp sensor failure
Cooling plate sensor failure
Current sensor failure
Restart memory failure
Compressor drive module failure
PFC module failure
Compressor start failure
Compressor running failure
Inverter board over current protection
Inverter board overheat protection
Current protection
Cooling plate overheat protection
Fan motor failure
Power filter plate No-power protection
PFC module over current protection
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