|
|
| PROBLEM |
| POSSIBLE CAUSE |
| SOLUTION |
|
|
|
| Compressor will not start |
| Broken or loose wire. |
| Check all wire & connections. |
|
|
| |
| Compressor off on internal overload. |
| Allow to cool; will start automatically. |
|
|
| |
| Low voltage to unit. |
| Check voltage and correct. |
|
|
| |
| High pressure switch tripped. |
| Press reset switch. |
|
|
| |
| Low pressure switch tripped |
| Check refrigerant charge. |
|
|
| |
| Compressor discharge temperature switch tripped. |
| Check refrigerant charge. |
|
|
| |
| Defective start relay, start capacitor, run capacitor, transformer or compressor. |
| Replace defective component. |
|
|
|
| Dehumidifying coil iced up. |
| Return air below 45°F. |
| Raise return air temperature. |
|
|
| |
| Filters dirty or clogged. |
| Replace filters. |
|
|
| |
| Low air flow. |
| Check blower motor and belt.
Adjust blower speed.
Check blower rotation
Check duct design. Refer to manual for proper sizing and design. |
|
|
| |
| Low refrigerant charge. |
| Add Refrigerant (see charging procedure). |
|
|
| |
| Bad expansion valve. |
| Replace expansion valve. |
|
|
| |
| Restricted drier. |
| Replace drier. |
|
|
| |
| Restricted distributor tubing. |
| Replace distributor tubing. |
|
|
| |
| Restricted distributor. |
| Replace distributor. |
|
|
|
| High head pressure |
| Low air flow. |
| Adjust blower speed. |
|
|
| |
| Return air short cycling. |
| Check duct design and readjust supply and return air registers. |
|
|
| |
| Refrigerant overcharge. |
| Adjust refrigerant (See charging procedure). |
|
|
| |
| Non-condensable in system. |
| Evacuate and recharge system. |
|
|
| |
| Dirty coils. |
| Clean all coils in unit and remote if equipped. |
|
|
| |
| Dirty filters. |
| Replace filters. |
|
|
|
| Head pressure switch tripping (same as above) |
| Blower running too slow. |
| Adjust blower speed up. |
|
|
| |
| Blower turning backwards. |
| Change blower rotation (3 phase only). |
|
|
| |
| Motor going off on internal overload. |
| Check for rated AMP draw. Replace motor if defective. |
|
|
| |
| Dirty filters. |
| Replace filters. |
|
|
| |
| Supply and return air registers restricted or blocked. |
| Remove restrictions or blockages. |
|
|
| |
| Refrigerant overcharge. |
| Adjust refrigerant (see charging procedure). |
|
|
| |
| Dirty coils. |
| Clean all coils in unit and remote if equipped. |
|
|
| |
| Defective head pressure switch. |
| Replace head pressure. |
|
|
|
| Low head pressure |
| Low refrigerant charge. |
| Add refrigerant (see charging procedure). |
|
|
| |
| Return air temperature too low. |
| Return air temperature must be minimum 45°F. |
|
|
|
| High suction pressure |
| High air flow. |
| Incorrect duct work causes stratification of air on inlet. |
|
|
| |
| Return air temperature too high. |
| Lower temperature in room. |
|
|
| |
| Defective compressor. |
| Replace compressor. |
|
|
|
| Low suction pressure |
| Refrigerant charge low. |
| Adjust refrigerant (see charging procedure). |
|
|
| |
| Low air flow. |
| Adjust blower speed. Check blower, motor and pulley. |
|
|
| |
| Return air temperature too low. |
| Raise return air temperature. |
|
|
| |
| Dirty filters |
| Replace filters. |
|
|
|
| High humidity in space |
| Incorrect duct work. |
| Check duct work design (see manual). |
|
|
| |
| Low air flow. |
| Adjust blower. Check blower, motor and pulley. |
|
|
| |
| Dirty filters. |
| Replace filters. |
|
|
| |
| Outdoor condenser not operating properly. |
| Clean outdoor coil and check blower, motor and belt. |
|
|
| |
| Refrigerant system overcharge. |
| Check pressures. Adjust per manual. |
|
|
| |
| Unit too small or not enough capacity to handle humidity and problem. |
| Refer to guide lines regarding sizing dehumidifiers for load and applications. |
|
|
){kind=link}
){kind=link}