Wilkins Water Control Products
Thermostatic Mixing Valve Troubleshooting
| Symptom | Probable Cause | Remedy |
| The desired mixed water temp. cannot be obtained or valve is difficult to set. | Hot and cold suppliers are reversed, valve is full of debris, or strainers are fouled | Refit valve so H &C are correct, flush valve with water, and clean strainers |
| Mix temperature is unstable | Strainers are fouled or fluctuating supply pressure | Clean strainers and install pressure reducing valve's on H & C inlet supplies. |
| Mix temperature changing over time | Fluctuating supply pressures or strainers are full. | Install pressure reducing valves and clean strainers. |
| Either full hot or cold water flowing | Valve is set incorrectly | Adjust mix. Temperature to 95° F-131° F |
| No flow from the valve outlet. | Hot or cold water supply failure or strainers are fouled | Restore inlet supply & check mix. Temperature and clean strainers |
| Flow rate reduced or fluctuating | Valve or inlet fitting fouled by debris. | Check valve and inlet fittings for blockage. |
| Mixed water temp. too hot or cold. | Valve has been tampered with, valve incorrectly set, or inlet temperatures are not within specified limits. | Re-adjust to required set temperature to ensure inlet temperatures are within specified limits. |
| Mixed water temperature does not change when the temperature adjuster is moved. | Hot and cold supplies are reversed. | Refit the valve to the correct hot and cold configurations. |
| Hot water flows into the cold water system or vise versa. | Valve is fouled. | Clean strainers and remove debris. |
| Valve is noisy. | Water velocity is too high. | Reduce water velocity. |
Click below for installation and maintenance sheets:
ZW1017
Installation and Maintenance sheet
ZW1017HT
Installation and Maintenance sheet
ZW1017MM
Installation and Maintenance sheet
ZW1070
Installation and Maintenance sheet