We ran 2 deep baths in close succession and this made the water pressure drop to a point we weren't getting any hot water from the taps. I opened the valves on our Vailliant EcoTech boiler and topped up the system, however no water is coming out at all now. Stupidly I topped up the pressure with the boiler still on, so I've obviously caused an airlock. Any tips on how to sort this out?
At the boiler should be a purge setup. This consists of a valve to shut the zone off, and downstream of that valve is a drain ****. Attach a hose to the drain ****, and with the boiler running, close the valve and open the drain ****. (Turn the heat up on one zone at a time if you have multiple zones.) You should be able to notice when the air comes out of the hose by hearing it and the hose twitches and jumps when large amounts of air come out. After the air stops coming out, open the valve , close the drain, flip the bypass closed, and let the water circulate, then reapeat procedure. Do this until you hear or see no more air. You can run a long hose outside or you can use a bucket and a short hose. Using the bucket allows you to actually see the bubbles of air, but you will be dumping many buckets before you are done. Most boiler feed valves have a fast fill lever that bypasses the slow 12 psi that the boiler is normally fed at. Using this will speed up the purge considerably, but don't forget to flip the lever back down between, and after purging or the boiler relief valve will blow off and make a mess. Good luck!
SOURCE: a trickle of hot water from taps, central heating ok
it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve
SOURCE: worcester 350 boiler pressure low
That overflow is the Pressure Relief Valve.usually they are set at 3-3.5 bar but over time they can be gunged up inside and leak/allow water to flow out. Dismantle & clean or replace. Turn off mains water and ch pipes before removing - operate valve remove & allow for some water to leak from it
SOURCE: The Central heating is fine, although the pressure
there may be air in the system try to bleed the system of air and see if that resolves the problem.
SOURCE: Pressure gauge drops to zero when hot tap turned on
There are multiple types of systems that use the configuration you are talking about. We have no way of knowing what the system is but there is obviously a supply problem. Either the pump is not working correctly or the water supply has been constricted.
Testimonial: "Thanks Brad, really helpful, just had a call that the water main down the road has burst! So obviously fits in with supply constriction. Will wait for repair and fingers crossed, cheers again."
Hot water pressure relief valves serve two functions. The first is to remove high-pressure water from the hot water tank. The second function is to act as a high temperature valve to remove water that exceeds a predetermined point for the valve. Both of these relief settings are preset at the valve factory. Many pressure relief valves will come with a metal tag that identifies these release points. If you're attempting to remove the hot water heater pressure relief valve, pay careful attention to ensure that you replace with the correct valve.
Your hot water heater has a pressure relief valve safety mechanism. When pressure inside the water tank exceeds certain limitations, the valve opens up to allow the pressure to be released. A faulty pressure relief valve will not release excess pressure, which could cause extensive damage to your home. You should test the hot water heater pressure relief valve once every six months to ensure proper operation. If the pressure relief valve fails the test, replace the valve with a new one immediately
Locate the pressure relief valve on your hot water heater. The pressure relief valve has a lever handle on top with a drain pipe attached to it. The pressure relief valve is most often on the side of the water tank toward the top. Newer models of hot water heaters have the pressure relief valve on top of the water tank.
Inspect the area around the pressure relief valve for signs of leaking water. If there is leaking water near the relief valve connection, replace the relief valve. If no leaking is evident, proceed with testing the pressure valve.
Examine the area below the pressure relief valve drain pipe. Most water heater closets either have a drain in the floor below the pipe or the pipe is inserted into another pipe to direct the water out of the home. If the end of your drain pipe is not in another pipe or there is no drain in the floor, place a bucket under the drain pipe to catch water when you test the pressure relief valve.
Pull the lever handle on the top of the pressure relief valve up with your fingers. A working lever will lift up without difficulty.You should begin to hear water going through the drain pipe. Slowly release the lever to shut off the pressure relief valve. The pressure relief valve is good. If you did not hear water running through the drain pipe, lower the lever on the pressure relief valve and replace the valve. If the lever is difficult to raise, do not force the lever. Replace the pressure relief valve.
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