I switched the heating off for a week back in August (previously had it coming on briefly on timer to heat the water), and when I put it back on it won’t heat the radiator or the water.
Things I have tried:
Put it on constant for a few days. (It clanks, shudders and heats the first metre of pipe)
Turning off the boiler, turning off the pilot light, and re-lighting.
Running all my hot water taps for 10 minutes with the boiler on.
Made no difference at all. It seems I have an airlock (I guess). Or is it the pump? Help much appreciated!
Edit: I bled the radiator, but I get nothing but a stream of clean water (should I persevere?)
I switched the heating off for a week back in August (previously had it coming on briefly on timer to heat the water), and when I put it back on it won’t heat the radiator or the water.
Things I have tried:
Put it on constant for a few days. (It clanks, shudders and heats the first metre of pipe)
Turning off the boiler, turning off the pilot light, and re-lighting.
Running all my hot water taps for 10 minutes with the boiler on.
Made no difference at all. It seems I have an airlock (I guess). Or is it the pump? Help much appreciated!
I would say thayt you seem to have a problem with the pump,Or the supply tanks have insufficient water in them. To check the pump, place the blade of a screwdriver against the pump body and the other end against your ear. Have boiler switched on and off so you can hear if there is a difference when it is switched on.As to your water tanks, you will have a large tank that supplies your hot water. the water level in this tank should be about 2 inches (50mm) below the overflow. The smaller tank supplies your heating and this should have about 4 inches (100mm) of water in it.
You could try backfilling the water in the tank by running a hose from the outlet. Turn off all your heating attached the pipe and turn the hose on. This may free the airlock. I take it you have bled the radiators? The other thing may be to turn off all the hrating and drain of the system. Then refill making sure the radiators are bled. Can you hear the pump running? This can also be bled from the top of the pump. The other thing to bear in mind is that gunge can build up in the system and congrgate at the lower ends of the system. Job for a plumber this. Good Luck
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Find the highest point in the heating system and look for a air bleed valve make sure that your pump is running. Or a valve may be closed.
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Turn it on and hit the pump carefully but firmly with a hammer.
They tend to seize up a bit through lack of use sometimes.
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It sounds like both. The pump will usually clear an airlock.
Turn off the thermostat under the boiler, but turn on the room thermostat. Switch on both heating and hot water. You can now check the pump by taking out the screw on the front and checking whether it’s going round (warning, have a bowl handy, water will leak out when you remove the screw). If the pump’s not turning, you need a new one. If it is, you’ve just got an airlock. Out the screw back and switch everything off.
Connect a hose between the central heating drain-off tap and the mains water. Open the drain-off tap first, then turn on the mains. This should shift the airlock (noisily). Don’t keep it on for more than a few seconds or your header tank will overflow. Turn all the taps off and take the hose away. Then drain off some water from the heating or you’ll get an overflow when it heats up.
References :
Your hot water may be gravity fed, (four pipes coming off the boiler), check the pump, if it is gravity hot water, running the water through summer won’t start the pump, so it seizes, may sound like it is running, remove screw from centre of pump (with heating on) check spindle is turning. If fully pumped (two pipes off the boiler) you have a blockage, probably near the diverter valve (silver box in airing cupboard), or diverter valve itself is blocked.
References :
Heating engineer
tap on auto fill valve it may stiking, u may need to back fill but first check the gauges first ,the "Altitude" # shows how many feet to top of system if its reading 8-10 ft. or well below the top of the highest point you will need to add a few pumps of air into pressure tank above the boiler. Is the pump motor turning the impeller? if its making a racket /shaking the coupler may be broke, you will need a 1/2 in. box wrench and a hex key set to remove pump motor and tighten or replace coupler . Let me know how ya do .
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yrs & yrs by trade
I would say thayt you seem to have a problem with the pump,Or the supply tanks have insufficient water in them. To check the pump, place the blade of a screwdriver against the pump body and the other end against your ear. Have boiler switched on and off so you can hear if there is a difference when it is switched on.As to your water tanks, you will have a large tank that supplies your hot water. the water level in this tank should be about 2 inches (50mm) below the overflow. The smaller tank supplies your heating and this should have about 4 inches (100mm) of water in it.
References :
Plumber.