New single handled type shower tub faucet in a new house in Mexico. 250 gallon gravity fed tank on roof. Has boiler. Water comes out real slow. Appears when in cold position no water comes out, only hot water. I'm assuming it's clogged.
- Took off tub water inlet
- Connected small pump
- Shut off water supply
- Took off the cold water line from hot water heater inlet
- Turned on pump
No water comes out of the unhooked heater hose. Does this valve have a check valve built into the valve, which is not allowing water to go backwards through the valve?