Comp. Gas high(High

pressure≥3.0MPa)

1. Refrigerating System is blocked.

2. Refrigerant content is excessive.

3. Condenser is dirty.

4. Current of cooling water is small

5. Fan does not work

6. No cooling water

1. Replace filter-dryer

2. Reduce refrigerant

3. Clear up condenser?

4. Clear up filter of cooling

water

5. Replace fan or capacity.

6. Cooling water supply

1. Lack of refrigerant

2. Block of refrigeration system

3. Thermostat is faulty

4. PT-100 is faulty

5. The condenser is dirty.

6. Current of cooling water is small

7. Contactor does not work

8. Contactor is faulty

9. Exhaust fan does not work

1. Check the refrigeration system,

and filling the refrigerant

2. Replace filter-dryer

3. Confirm the parameter of the

thermostat is in consistent with

this user manual

4. Replace the platinum resistor

5. Clean the condenser

6. Clear up filter of cooling

water

7. Check the control circuit of

the contactor

8. Replace the AC contactor

9. Pressure-control switch fault

Or replace the fan motor or fan

capacitor

10. Replace the compressor or the

capacitor of the compressor.

Big deviation of

water temperature

Solenoid valve or electric control

trouble

Replace solenoid valve or electric

control parts

Too large of water

temperature

deviation

Solenoid valve or electric control

fault

Replace the solenoid valve or

electric control element

Thermostat LED no

light

Thermostat is faulty or F1 (0.5A) is

faulty

Replace the thermostat or F1

（0.5A)

1. F2 (10A) fuse is broken

2. Shaft of the pump is adhered to

the water seal

3. The control of the pump has

problem

4. Fault of capacitor of water pump

1. Replace the F2 (10A)

2. Rotate the pump shaft in

clockwise by the minus screwdriver

3. Check the control loop of the

water pump

4. Replace the capacitor of the

water pump