Worcester Greenstar 25Cdi, Worcester Greenstar 27 Cdi, Worcester Greenstar 30 Cdi, Worcester Greenstar 31 Cdi. Got boiler running--circulating pump hot but not feeling pipes getting any heat?? We only put it on for an hour in the morning and an hour at night. Recently the circulator pump (taco) has been running constantly even though no zones are calling for heat. The PCB is faulty and telling the pump to run when it should not be running. The circulator pump on Weil-Mclain boiler keeps running. A proper pump diagnostic needs to take place. Lets get rid off the heating valve first, you say you switch the htg off and the pump and boiler keeps running but the rads don't get hot, that is what one would expect, because as soon as you take the power off the valve it closes, so forget it. Page 1 of 2 1 2 Next > goodtyneguy Member. The mid position valve is sticking (this can be lubricated with WD40). Felt the radiator in the bedroom and it was red hot. If the rads are cold when the pump is over running then I suspect the pump is controlled by the boiler and something is bust. Boiler running all the time even with the programmer off. I tried moving the manual zone valve levers figuring maybe it was stuck a little bit but that didn't help. Other that that it is all working perfectly, heating working when I need it in every room and loads of hot water. The main problem with the pump and boiler running all night is that the boiler is in the garage which is difficult to access in the night/morning to turn off/on so if I could use the on/off switch on the pump until I fix the MVs that would be great. Get a fixed price for a new Worcester Bosch online. The control panel indicates a continuous "call for heat". Turned the boiler off at the mains and the radiators slowly cooled, but there was a constant noise from the A/C, as if a pump was constantly running. Faulty pump. The problem is that the boiler pump seems to run continuously in the boiler (24 hours a day). Rick. My base-board heating is not hot. Everything seems to work ok when I require either DHW or CH but the pump will continue to run constantly after the event. Either way, I would expect the circulator pump would stop running if no heat is being called for, and the water tank is not calling for heat. Whenever a cold snap hits – lower than 25 degrees here in Atlanta Metro – your furnace or heat pump may seem to run constantly, leading you to believe that perhaps your unit is too small and unable to keep up. Checked the room stat (DT90E) on the landing and the temp was showing 25C set at 21C. It got so annoying that I decided to turn the wall thermostat controls to 'off' but it still does it. T. tipintim. Worcester Bosch Cdi Boiler Pump Running Constantly Working; Central Heating – Over running pump – Advice needed After a weekend of pretty heavy use our central heating system is showing its age a bit ðŸ™x81 Sunday night after the heating “clocked off” the pump continued to run despite the boiler being off. … Looking for suggestions on how to control the circ pump (Boiler pump [20 plug] p68 of Start-Up/Service instructions) so that it is only on when there is a call for heat from one of the 3 zones. Thanks . Lv 5. This problem appeared to exist (at leat intermittently) on the system before the old boiler was replaced (the valves were not replaced). All the zone valves appear to be closed. Discussion in 'Plumbers' Talk' started by Old_duffer, Jan 16, 2018. In the past, we’ve seen pumps constantly running due to: Faulty PCBs (the circuit board on the boiler). Our two year old TACO cartridge cirulator pump is running constantly and now very hot (moreso than the supply pipes) - probably been running that way for a couple weeks, at least. 32,405 satisfied customers. There is a simple explanation for this. Arms . You should also check the temperature of the water. High efficiency, modern gas boilers fire at different rates depending on the load. Old_duffer New Member. If it develops a fault then the hot water won’t be able to leave the boiler which could cause the unit to overheat. The job of the pump is to circulate water around the central heating system. It's making a louder than normal sound as it runs, almost like sandy water/grinding noise. The boiler has a weather compensating controller fitted (FW100 or Wave smart internet connected controller). All appeared to work ok for the 1st month or so of use after the boiler was put in. Possible causes are a faulty pump overrun thermostat or timer, or a damaged PCB (Pump Circuit Board). If the pump is running for hours on end, or constantly, there may be an issue with the system. Checked the programmer and both heating and hot water … I've recently noticed that the central heating pump (Grundfoss) is running all the time. The boiler "issue" I had was that when a call for dhw was initiated, the boiler pump turned off as to keep the boiler from pumping too hot water into the system, and yet the system pump stays on for the duration of the call, cooling the radiators off substantially. Furnace Running Constantly? The boiler was just cleaned last week, but I can't say it has been running since then, or if this started prior to the cleaning. I have a recently installed oil fired burnham steam boiler. Midwest-Esteemed. The water does get very hot even though the (new) tank thermostat is set to lowest position. Generally, no. I have a recently installed oil fired burnham steam boiler. I've moved into a new flat that has a vaillant boiler. I have resorted to switching off pump because it is beginning to annoy me! What's New 3 12 24 72. boiler not firing up, pump seems to be running… Can this be a relay on the control panel in the boiler or the aquastat on my super-store hot water tank? Pump overrun stat is faulty. 0 0. More complete answer: It depends upon how the boiler is configured. It's entirely possible that it's had been running for the two years that we lived here. This official sponsor may provide discounts for members. ?--stuck circulator? It does not seem that a zone valve is stuck, the various parts of the house heat and cool normally and it's not like the heat is constantly running in a zone. No water running around the system ; Noisy circulator pump; Blocked pump; Leaking pump; Incorrect speed settings; Loss of power; Pump won’t switch off; Incorrect installation; No water running around the system. To: faulty PCBs ( the circuit board on the 24 hour setting to heat some up. 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