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There are multiple possibilities:
- the power to the main control could be off (seems unlikely if you can turn the water flow on and off)
- the thermal element that heats the water could be burned out (may not be a problem if this is only a mixer unit and relies on external hot water supply)
- there could be a problem with the solenoid that opens to allow hot water to flow through the unit
- there could be either no hot water getting to the unit or blockage so that hot water will not flow through to the mixer
Start by making sure there is power. Then you may need to disconnect the hot water supply (after turning it off at the source) and then check to see that hot water will flow. If you get hot water to the unit then there is something internal keeping the hot water from mixing with the cold.
under the throttle body is the cold start unit where two hose pipes are and the one works as an inlet with first start with cold and after with hot water feeding and the other as out hot water return to engine. The job of that unit is to get the water temperature and as electronic connected with the ecu is giving the message for cold start rev up until the water temperature change to hot and revs dropped to the correct according to ecu. most propably is either one of the two hoses leaking or the flange itself.
16 yrs old? Im guesing this is a hot water heater.Not a air conditioner.
If its still making hot water you may not need to replace the whole unit.
The valve that is leaking is a high pressur relief valve and they do go bad the sprigs become weak over time and some corrosion may not allow the valve to seat properly.
1st step is to shut off all incoming and out going water to the tank.
2nd Shut off fuel or gas to the unit, and annonce to everyone your are working on the hot water heater.
3rd at the very bottom should be a drain valve much like a hose spicket,open this slowly and drain the tank,remember the water will be hot.You may not need to drain it all the way,while draining pop open the relief valve,when you stop getting water from it,you are below it and can turn the drain valve off.
4th remove old relief valve and replace with a new one,i think they are rated at 15 psi or 30 psi blowoff pressure,hopefully there is a tag on it with that info.
When you go to install your new one use some pipe thread compound or teflon tape around the threads before you reinstall valve.
Once done slowly refill tank with water, check for leaks.When full open up hot water valve to house and relight buner.open a faucet in kitchen to hot to bleed off any air.
YOU COULD HAVE A DEFECTIVE WATER PUMP OR THERMOSTAT ALSO RADIATOR PRESSURE CAP.MAKE SURE YOUR WATER PUMP IS BEING TURNED BY DRIVE BELT.NOT SLIPPING.MAKE SURE COOLANT SYSTEM HAS BEEN BLED AND YOU HAVE HALF ANTIFREEZE HALF WATER.CHECK YOUR CRANKCASE WHEN CAR COOLS DOWN.IF OIL STILL LOOK LIKE MILK SHAKE.YOUR NEW HEAD GASKETS LEAKING.THE MECHANIC WHO REPLACED HEAD GASKET DIDNT DECK THE HEADS.THEY PROBABLY NEED SHAVED A LITTLE SO HEAD GASKET WILL SEAL.
If this is an electric unit, you have to remove the cover to locate the thermostat. It sounds like the thermostat is malfunctioning. The excessive hot water can cause a unit to leak due to the expansion of the unit due to the overly hot water. Make sure that your breaker is off before you remove the covers to expose the thermostat.
if the leak is behind the handle take the handle off and tightn the packing nut, do not over tighten, as far as luke warm water is this with just one facucet on, they way these tankless water heaters work they are by gpm, gallons per min, if you have more gallons of water going thru the unit then it is designed for then it won't get hot, if your water pressure is to high going thru it will push it to fast thru the unit and won't get hot, your house pressure should be no higher then 75lbs no lower then 65lbs
To add an ExtensionKey: - DONT lift handpiece, enter [*91] then press a vacant memory key and then choose “Repdial Key” from the menu. Enter an extension or group number and press the [ü] key.
To dial an ExtensionKey: -
Press the memory key you programmed.
Storing a personal speed dial number: - Lift handpiece. Dial [*92] Dial memory number. (*0 - *9 for personal numbers) Press the [ü] key. Dial 0 then the number to be stored. Press the [ü] key. Hang up.
How to dial speed dial numbers: -
Dial memory number.
(*0 - *9 for personal numbers)
(001-999 for system numbers) For Example: [*7*0 ü] will call the personal number stored under position *0. [*7001 ü] will call the system speed dial number stored under position 001.