| No. | Description | Possible reasons | Action |
| 1 | The H.P. is weak when it is working | 1, The needles are not good. 2, The bearings are not good. 3, The working pressure is too low. 4, Obstruction inside the nozzle. | 1, Change the needle. 2, Change the bearing. 3, Check air pressure. 4, Check the duct. |
| 2 | The working pressure is unstable. | 1, The air filtration valve is blocked. 2, The air duct is tangled. 3, The air supply is not turned on fully. | 1, Clean the air filtration valve. 2, Check the duct. |
| 3 | There is no water blowing out from the H.P. | 1, The water pipe of H.P. is blocked. 2, The triple diaphragm valve is not well adjusted. 3, The water adjusting valve is not well adjusted. | 1,Refer to the operation manual of the H.P. 2,Check the triple diaphragm valve. 3,Adjust the water-adjusting valve. |
| 4 | Air leakage in the H.P. when it is not being used. | The rack valve assemble location alteration | Open single switch, adjusting the front and back position of the single switch. |
| 5 | Source of water pressure regular, but the machine have no water | The water filtration valve be block | Clean or replace a water filtration valve |
| 6 | H.P. has a gas anhydrous | Water pressure is too low | 1,Raise water pressure 2,Replace the gas valve control |
| 7 | The dental chair has unusual noise when action , within machine | 1, The motor component is damaged or loose 2, Be obstructed | 1, Renovation the damaged or loose component 2, Dislodge obstructed object |
| 8 | Leakage in the H.P. connection. | The washer of the high-speed H.P. is not good. | The washer should be replaced. |
| 9 | There is no water springing out from the spray gun. | The water pipe is blocked | Check the pipes. |
| 10 | There is water vapor when spraying with the spray gun. | There is too much water accumulated in the air filter. | The filter should be drained. |
| 11 | Mouth wash is not hot | The heater controls circuit malfunction or the heater burns | Replace the control circuit malfunction or change a water heater |
