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| Problem | Cause | Remedy |
| Checkmate
Devise Gas will not flow through unit |
1. Detector Tube not fully engaged 2. Clogged needle nozzle (inlet/outlet) 3. Defective detector tube 4. Rubber Septum dislodged blocking needle-nozzle |
Make sure metering Cap is screwed down
tight. Blow clear with high pressure gas. Use solvent cleaner. Hone out with small diameter wire. Try different tube Remove obstruction |
| Gas flows through tube but can't reach desired Termination Pressure. | 1. Low ambient temperature. 2. Partially clogged needle. 3. Defective detector tube. 4. Loose hose. 5. Insufficient gas charge. |
Warm up gas or conduct two passes at 1/2
the recommended Termination Pressure. Clean unit. Replace detector tube. Tighten all connections. No Refrigerant in liquid phase. |
| Gas leakage | 1. Broken needle. 2. Cracked detector tube. 3. Loose hose. |
Replace unit Replace detector tube Tighten all connections |
| Oil Test Refrigerant bleeds but no Oil. |
1. Low system charge. 2. Fractional Hp Compressor. 3. Insufficient bleed. |
Top off sight glass. Try supplemental method (pg.5). Be persistent and patient. Milk system at start up (pg. 5). |
| Oil Flows too fast and races past Indicator | 1. Bleed pressure too high. 2. Caught off guard. |
Reduce volume of gas flow and insert new
tube. Be attentive to the test and always be ready to stop flow. |
| Vapor Test Acid tube did not change white or yellow. |
Negative for Acid. | Conduct an Oil Phase test if testing a system. |
| Moisture tube did not change to Purple or Blue | 1. Acidic Refrigerant Gas. 2. Moisture less than 1 ppm. |
Conduct acid test. Very rare condition. |
| Indicator layer of Moisture Tube is Purple/Blue when removed from pkg. | Expired Moisture tube. | Shelf life is 6 mo. to 1 yr. Longer if stored under refrigeration. |
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