6 720 646 804
Troubleshooting/Problem Solving
29
E6 T5 sensor malfunction 1. Check wires for damage. Measure resistance
from control board connection. Refer to ther-
mister table 7
2. Check wire connections from sensor to con-
trol board.
3. Check T5 sensor for damage.
4. Check T5 whether interfere with strong mag-
netic field.
E7 Heat pump malfunction 1. Heat pump has cycled off. If Temperature set-
ting is >5°F above tank temperature, the heat
pump should restart within 15 minutes.
2. Spot inspection, check the last three error
codes to evaluate problem. Call service provider.
"LOCK + UP" Enter spot inspection.
E8 Water temperature is too high (T2 165°F) 1. Power off can resume.
2. Check actual water temperature. Replace T2
sensor if defective.
P0 Out of Run condition C Run condition C:
T3a (30min) > 20°F
Cont. check after 30 min.
P1 Out of Run condition D Run condition D:
T3b-T3a > 3°F
Cont. check after 30 min.
P2 Out of Run condition E Run condition E:
T4 < 240°F
Cont. check
P4 Compressor current is too high 1. Check that supply voltage > 260 VAC.
2. Check compressor for damage.
P6 Out of Run condition A Run condition A:
T4 (5 min) > T4 (0 min) + 15°F
One time check
P7 Out of Run condition B Run condition B:
T4 > 100°F
Cont. check after 30 min.
Error code Meaning Solutions
Table 6
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