Toshiba ESTIA HWS-1102H-E, Engineering Data

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7. HYDRO UNIT INSTALLATION MANUAL
Engineering Data Book
7
12
TROUBLESHOOTING
Fault Symptoms
Symptom Possible cause Corrective action
Room is not heated or
cooled.
Water is not hot enough.
Incorrect remote controller setting
Check remote controller operation and temperature
setting
Incorrect function code setting Check function code setting with the function code table.
Backup heater disconnected Check backup heater and bimetal thermostat.
Insufficient capacity Check selection of equipment.
Sensor defect
Check whether temperature sensor is installed at the
normal position.
Nothing is displayed on the
remote controller.
Power is not supplied. Check power supply wiring.
Incorrect setting
Check DIP switch setting on the Hydro Unit board.
Check the setting with the function code table.
Flow rate switch is
activated.
Error code [P01]
Air bite in the pump Release air completely according to the procedure.
Low hydraulic pressure
Set hydraulic pressure considering pipe height, and
replenish water until manometer shows a value of set
hydraulic pressure or more.
Strainer is clogged. Clean the strainer.
Large resistance on the hydro side
Widen water path to the hydro unit or adopt a bypass
valve.
Malfunction of motorized 3-way valve
for hot water supply
Check wiring and parts.
Hot water leaks from
pressure relief valve.
Excessive hydraulic pressure
Set hydraulic pressure considering pipe height, and
replenish water until manometer shows a value of set
hydraulic pressure or more.
Insufficient capacity of expansion tank
Check expansion tank capacity compared to total water
amount. If it is insufficient, install another expansion
tank.
Expansion tank failure Check the air pressure.
Alarm
indication
Alarm description and generation/reset conditions
E03
Regular communication error between hydro unit and remote controller (system controller)
If there is no regular communication from the remote controller for three minutes, the hydro unit regards it as no
remote controller. If there is no communication from both sides, alarm E03 occurs.
Auto-reset: When successful regular communication is made
E04
Regular communication error between hydro unit and outdoor unit
When serial signal from the outdoor unit cannot be received though normal serial signal is sent to the outdoor
unit
1) When serial signal cannot be received continuously for 60 seconds (S code communication)
2) Communication is still not successful for 80 seconds through three retries if serial signal cannot be
received for 20 seconds after new communication (f code) starts
When the remote controller starts operation, serial transmission starts with the new communication format.
Auto-reset: When successful regular communication is made
F03
Condensing temperature TC sensor defect
If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
F10
Hydraulic heat exchanger inlet temperature TWI sensor defect
If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
F11
Hydraulic heat exchanger outlet temperature TWO sensor defect
If short-circuit or open-circuit state continues for two seconds, an alarm occurs.
Auto-reset: When normal value is confirmed
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