Hi, baxi 80e gets up to full temp then shuts down,temp drops to 40 degrees and it fires up again until temp reatches 80 degrees then shuts down again.this happens continuasly as long as boiler is turned on,this is also causing problem to downstair rads which are luke warm and upstairs are hot,i have just replaced the temp sensor and safety thermostat and have just put in a new pcb.has anyone else had this sort of problem that can give me some advice,any help or advice would be greatfully appreciated.
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Re: boiler shuts down repeatidly
Sounds like ur circulating pump is giving up in the end of pump theirs a screw un do this and check that pump isn't seized up if its ok u will see it turning if not change pump, after u change pump test again if boiler starts to over heat again u will need to de scale heat-exchanger ,hope this helps ,any more probs give us a call Joe
I think you will find that instead of modulating as demand requires the boiler is overheating and then re operating after the safety thermostat has operated.
i wilud put some de scaler into the main heat exchanger circuit or add it to the radiators and let it circulate for a while.
also make sure the pump is operating properly to ensure proper water flow.
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the thermostat has an upper and lower setting at which point to turn the unit off and back on
most have a 10 degree variation between off and on so that a steady temp is maintained
check to see if the lower setting can be raised closer to the 80 degrees
if not consider a new thermostat with closer settings
Hot water is gravity fed through your pipes. When you turn the faucet on the water will flow through the pipes. If your hot water heater is natural gas driven relight the pilot. Same if oil fueled. If electrical, check fuse to see if it has blown or the circuit breaker has tripped. If either has tripped, replace it and if it blows again the heater has a serious failure, you might need to buy a new one. If pilot won't light on gas unit, try relighting after 5 minutes, could be a bad thermocouple.
Pressure inside the tank will rise along with the water temperature. As the water inside cools the pressure will wane until the heating element turns on and reheats the water with a subsequent rise in pressure. Running the hot water at the same time will draw heat energy from the boiler and lower the internal temp and pressure as well.
Silver flex hose may be the (correct) filling loop. There may be a valve at each end of it, maybe just one at one end. Open the single valve slowly and LISTEN for the sound of water entering the system, and LOOK for signs of the pressure gauge rising. On the dual valve version open the first, then open the second slowly as above. Close both valves when pressure is adequate. Adequate is determined by the specifics of your system, but note that more pressure DOES NOT mean better showers, etc. It should only take a few seconds to top-up, any longer indicates a significant loss of fluid from the system.
first off ensure water is getting to boiler, next, No pilot = pressure switch. On my baxi solo 40 pf pressure switch is replaced 8-10 times a year cures your problems,,,,,,,, momentarily , and have had all your other parts,but with no effect to speak of,.......sorry............ solution = [ change boiler ].sounds like gas pressure or lack of water to system or **** boiler like mine .........good luck.