When The Following Symptoms Are Found - Toshiba MMD-VNK802HEXE Owner's Manual

Air to Air Heat Exchanger with DX Coil Unit
Maintenance of the humidifier element
The replacement cycle of the humidifier element varies greatly depending on the conditions of use. Refer to the
cycles below as general replacement cycles. (They are not the terms of guarantee.)
When the water hardness is 25 mg/L
When the water hardness is 50 mg/L
When the water hardness is 100 mg/L
• The humidifying performance deteriorates gradually as impurities in tap water are accumulated in the
humidifying element.
• In general, replace the humidifying element when the humidifying performance of the element has deteriorated
by 20 to 40% compared with that of a new one.
• Estimated operating hours: 10 hours per day X 20 days per month X 5 months per year = 1000 hours per year
• The amount of impurities accumulated in the humidifying element is largely dependent on the water quality
(water hardness, the variety or amount of impurities, the pH of the water, water temperature, etc.) or conditions
of use.
23-EN
Owner's Manual
Every 5 years
Every 3 years
Every 2 years
Air to Air Heat Exchanger with DX Coil Unit
10

When the Following Symptoms are Found

Check the points described below before asking repair servicing.
Symptom
• "Swish" sound is heard
sometimes.
• Slight clacking sound is
heard.
• " " indication is lit.
Indoor unit
• " " indication is lit.
• " " indication is lit.
• Sound or cool air is output
from the stand by indoor
unit.
• When power of the Air to Air Heat
Exchanger with DX Coil Unit is turned on,
"Ticktock" sound is heard.
• LCD blurs when it is touched.
Operates or stops automatically.
Does not operate.
The unit runs in the ventilation mode only
– 12 –
Cause
• When the operation has started, during the operation, or immediately after
the operation has stopped, a sound such as water flows may be heard,
and the operation sound may become larger for 2 or 3 minutes
immediately after the operation has started.
They are flowing sound of refrigerant or draining sound of dehumidifier.
• This is sound generated when heat exchanger, etc. expand and contract
slightly due to change of temperature.
• When cooling operation cannot be performed because another indoor unit
performs heating operation.
• Is outdoor temperature out of operation temperature range?
• When the manager of the Air to Air Heat Exchanger with DX Coil Unit has
fixed the operation to COOL or HEAT, and an operation contrary to the
setup operation is performed.
• When stopping the fan to prevent cool air blow at starting heating.
• Since refrigerant is flowed temporarily to prevent stay of oil or refrigerant
in the stand by indoor unit, sound of flowing refrigerant, may be heard or
white steam when other indoor unit operates in HEAT mode, and cold air
in COOL mode may be blow-out.
• Sound is generated when the expansion valve operates when power has
been turned on.
• LCD may temporarily blur by static electricity.
• Is the timer "ON" or "OFF"?
• Is it a power failure?
• Is the power switch turned off?
• Is the power fuse or breaker blown?
• Has the protective device operated? (The operation lamp goes on.)
• Is the timer "ON"? (The operation lamp goes on.)
• Are COOL and HEAT selected simultaneously?
(" " indication is lit on the display of the remote controller.)
• Is outdoor temperature out of operation temperature range?
Operation stops automatically.
• Is outdoor temperature out of operation temperature range?
When the outdoor temperature is outside the range of cooling/heating
operation, the unit runs in the ventilation mode automatically.
Owner's Manual
EN
24-EN