Toshiba HWT-1101F21MM3W-E, Installation Manual

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Hydro Unit Installation Manual
11
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 the setting with the DN codes.
Almost no or little water
flow.
Error code [A01]
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
overpressure preventive
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.
Pump lock.
Error code [A14] Pump lock due to clogging of dust. Insert a Phillips screwdriver into the hole and turn to the
left or right to unlock.
hole
Defect mode detected by the Hydro Unit
Please don’t continue backup operation in a state of displaying a check code.
Remove the cause of the anomaly immediately.
O ....Possible
×
.....Not possible
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
operation
Automatic
reset
A01
Pump or flowing quantity error
Detected by flow rate abnormality
× ×
1. Almost no or little water flow.
• Not enough vent air
• Dirt clogging in the water piping system.
• The water piping is too long.
• Installation of buffer tank and secondary pump
A02
Temperature increase error
(heating)
(TWI, TWO, THO)
×
O
1. Check the water inlet, water outlet and heater outlet
(TWI, TWO, THO) sensors.
2.Defect of the backup heater (defect automatic
reset thermostat).
A03
Temperature increase error (hot
water supply)
(TTW)
Heating
O
Hot water
×
O
1. Check the hot water cylinder sensor (TTW).
2. Check the hot water cylinder thermal cut-out.
A04
Antifreeze operation
O
×
1. Almost no or little water flow.
• Dirt clogging in the water piping system.
• The water piping is too long or too short.
2. Check the heater power circuit.
• Power supply voltage, breaker, power supply
connection
3. Set the presence of the backup heater.
4. Check the water inlet, water outlet and heat exchange
(TWI, TWO, TC) sensors and flow sensor.
A05
Piping antifreeze operation
O O
1. Check the heater power circuit.
• Power supply voltage, breaker, power supply
connection
2. Check the water inlet, water outlet and heater outlet
sensors (TWI, TWO, THO).
3. Disconnection of the backup heater.
A08
Low pressure sensor operation
error
O
×
1. Almost no or little water flow.
2. Defect of the flow sensor.
3. On-load cooling or prolonged defrosting (a lot of frost
formation) under the above conditions.
4. Defect in the low pressure sensor.
5. Check the refrigeration cycle (gas leak).
A09
Overheat protection operation
(Thermostat of the backup heater)
× ×
1. No water (heating without water) or no water flow.
2. Defect of the flow sensor.
3. Defect of the backup heater (poor automatic reset
thermostat).
A10
Antifreeze operation 2 Heating
×
Hot water
O
×
1. Almost no or little water flow.
2. Check the water inlet, water outlet and heat exchange
(TWO, TC) sensors.
A11
Operation of the release protection Heating
×
Hot water
O
×
1. Almost no water flow.
2. Defect of the flow sensor.
3. Check the water outlet temperature sensor (TWO).
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