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Installation and Operating Instructions
8.1 Error code table
Error Code
Description
EC52
Temperature sensor T3 not detected
EC53
Temperature sensor T4 not detected
EC54
Temperature sensor TP not detected
EH00
Heat pump failure
EH03
Fan not detected
EH0b
Display communication failure to board
EH5d
Heating elements open circuit
EH5H
Temperature sensor TH not detected
EH5L
Temperature sensor T5L not detected
EH5U
Temperature sensor T5U not detected
Heat pump system fault (Activates when
PH20, PH21, PC30, PC06 appears 3
EHHP
times in a row or at least one error code
lasts longer than 1 hour)
FC06
Auto shut-off valve not detected
High temperature at TP (TP > 230°F
PC06
/110°C)
High refrigerant pressure detected
PC30
> 435 PSI when compressor on
> 350 PSI when compressor off
PH15
Electric leakage detected
Compressor is not able to heat up
PH20
refrigerant
PH21
Compressor working current too large
PH22
Leak sensor activated
T5L < 39°F/4°C and T4 < 45°F /9°C:
PH24
Frost Protection active
PH91
Evaporator temperature too low
Water temperature exceeds set point by
PH9b
9°F (5°C)
PHdH
Dry burning protection is running
PHL1
Water detected in condensate tray
Table 23
28 |
Result
Water heater will operate by using electric heating
elements only.
Water heater will operate by using electric heating
elements only.
Water heater will operate by using electric heating
elements only.
Water heater cannot operate
Water heater cannot operate
Water heater cannot operate
Water heater will operate by utilizing heat pump
Water heater will operate by using electric heating
elements only.
Water heater will operate by utilizing heat pump
Water heater will operate by utilizing heat pump
Water heater will operate by using electric heating
elements only.
Water heater can operate normally
Water heater will operate by using electric heating
elements only.
Water heater will operate by using electric heating
elements only.
Water heater cannot operate
Water heater will operate by using electric heating
elements only.
Water heater will operate by using electric heating
elements only.
Water heater can operate normally
Water heater will operate by using electric heating
elements only.
Water heater will operate by using electric heating
elements only.
Water heater cannot operate
Water heater cannot operate
Water heater will operate by using electric heating
elements only.
Bosch GreenTronic 7000 T Hybrid Electric Water Heater - BTC 755003301 A (03.2024)
Corrective Action
1. Check connector CN28 to main board
2. Check resistance, refer to chart "Electric Resistance Specifications"
1. Check connector CN28 to main board
2. Check resistance, refer to chart "Electric Resistance Specifications"
1. Check connector CN28 to main board
2. Check resistance, refer to chart "Electric Resistance Specifications"
Call technician
1. Check if fan can move freely
2. Inspect wire for damage
3. Check connector CN12 to main board
1. Verifiy display connector CN53 on main board
2. Re-energize unit
1. Verify wire connections
2. Check for resistance for elements (12.8 Ohms at 240 V)
3. Replace heating element
1. Check connector CN29 to main board
2. Check resistance, refer to chart "Electric Resistance Specifications"
1. Check connector CN24 to main board
2. Check resistance, refer to chart "Electric Resistance Specifications"
1. Check connector CN24 to main board
2. Check resistance, refer to chart "Electric Resistance Specifications"
Call technician
1. Check if auto shut-off valve is installed
2. If not installed, make sure F38 is 0
3. Replace faulty auto shut-off valve
Clears when TP < 194°F/90°C: if error repeats, call technician
Call technician
1. Disconnect from power immediately
2. Call service technician
1. Check if sensor are properly mounted
2. Check temperature delta on the refrigerant line
3. Call technician
1. Power off unit and wait 1 hour before re-energizing
2. If error persists, call technician
Check for leaks and fix leaking part
Frost protection deactives automatically.
If inlet air is ducted, consider taking indoor air
1. Check temperature sensor T3 (connections and resistance)
1. Check resistance of temperature sensor T5U
2. Replace if out of specification
Make sure water is in the tank by opening hot water faucet
Check if condensate drain is blocked
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