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. It's a grundfos pump working with a Potterton Suprima 30L wall mounted fan assisted balanced flue gas boiler. This problem appeared to exist (at leat intermittently) on the system before the old boiler was replaced (the valves were not replaced). Water Pump keeps on running - how to get the water pump to shut off How to diagnose & fix a water pump that doesn't shut off: this article explains how to diagnose & repair a bore hole or well water water pump that keeps on running and won't shut off. It got so annoying that I decided to turn the wall thermostat controls to 'off' but it still does it. Pump overrun stat is faulty. Worcester Greenstar Cdi. In the past, we’ve seen pumps constantly running due to: Faulty PCBs (the circuit board on the boiler). 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. 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. LOFT1009. Midwest-Esteemed. It's entirely possible that it's had been running for the two years that we lived here. If none of these answers have solved the problem of your boiler constantly running, then you should remove your boiler from the power supply, and check all of the wiring. Next you say the hot water works correctly, and have you checked it isn't sending a signal back to the boiler. The mid position valve is sticking (this can be lubricated with WD40). 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. Arms . 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. I have a recently installed oil fired burnham steam boiler. Reaction score 10,006. The pump on our system keeps on running well after everything has switched off - usually all day. T. tipintim. Furnace Running Constantly? boiler not firing up, pump seems to be running. As setup now the circ pump runs all the time when the outdoor temp is less than the Vitotrol 300 setpoint, wasting alot of energy. Sorry for all the questions and many thanks for your help so far. The control panel indicates a continuous "call for heat". One problem that’s overlooked when it comes to overheating boilers, is the pump. I have today got him to turn off the two other zones and run just the hot water and the pump is running constantly, sticky valve or knackered microswitch or wiring faux pas? 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. If there are issues with your boiler, you need a Gas Safe registered engineer to handle the repairs. A heating engineer might be able to repair the pump but it’s most likely that a new pump … If I trip the mains switch, the nosie is gone, but comes back as soon as I turn it back on. Supervisor. Discussion in 'Plumbers' Talk' started by Old_duffer, Jan 16, 2018. If it develops a fault then the hot water won’t be able to leave the boiler which could cause the unit to overheat. Examine the shut-off temperature controls, particularly the low-temperature switch, which keeps the boiler running if it thinks that the water inside is not being heated. Follow our boiler circulating pump troubleshooting checklist below to find out how to fix the most common problems. The PCB is faulty and telling the pump to run when it should not be running. I've recently noticed that the central heating pump (Grundfoss) is running all the time. What's New 3 12 24 72. boiler not firing up, pump seems to be running… High efficiency, modern gas boilers fire at different rates depending on the load. 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. Anyone got any ideas? It's making a louder than normal sound as it runs, almost like sandy water/grinding noise. Recently it burnt out and was replaced under warranty. Can't remember now, but nc … The boiler tripped out last night when I had it on the 24 hour setting to heat some water up. I have resorted to switching off pump because it is beginning to annoy me! Can this be a relay on the control panel in the boiler or the aquastat on my super-store hot water tank? Boiler running all the time even with the programmer off. My base-board heating is not hot. Discussion in 'Plumbers' Talk' started by goodtyneguy, Sep 8, 2010. … read more. This official sponsor may provide discounts for members. 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. The water does get very hot even though the (new) tank thermostat is set to lowest position. pump is running even with programmer switched to off position,I'm just wondering if the receiver is faulty (never encountered one before) thinking of disconnecting recieiver . If the pump is running for hours on end, or constantly, there may be an issue with the system. Worcester Greenstar 25Cdi, Worcester Greenstar 27 Cdi, Worcester Greenstar 30 Cdi, Worcester Greenstar 31 Cdi. The job of the pump is to circulate water around the central heating system. Woke up in the middle of the night rather hot. Thanks . At the end of last winter I discovered that the circulation pump was running constantly. The circulator pump on Weil-Mclain boiler keeps running. 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. 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. 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. Generally, no. Recently the circulator pump (taco) has been running constantly even though no zones are calling for heat. So you can get your boiler up and running again. I tried moving the manual zone valve levers figuring maybe it was stuck a little bit but that didn't help. The pump will run constantly to monitor the flow temperature and maintain heat curve. All appeared to work ok for the 1st month or so of use after the boiler was put in. Apr 10, 2017 #10 Without going back thru, could it be the heads gone on one of the valves? Recently moved into ths house and have had the heating on as well as the hot water. More complete answer: It depends upon how the boiler is configured. All the zone valves appear to be closed. I have recently noticed that the pump on my Vaillant boiler is running constantly even when there is no demand from either the DHW or CH. 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. The problem is that the boiler pump seems to run continuously in the boiler (24 hours a day). I set the wall controls so that the heating would only come on if it was below 22 degrees (which it hasn't been yet) but noticed that the boiler is constantly making a noise. You should also check the temperature of the water. The boiler has a weather compensating controller fitted (FW100 or Wave smart internet connected controller). 32,405 satisfied customers. 0 0. My Profile My Preferences My Mates. Every unit is installed with a “set point”. Been through the instructions manual and online and can't seem to … 10 years ago. 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. Rick. Possible causes are a faulty pump overrun thermostat or timer, or a damaged PCB (Pump Circuit Board). Lv 5. Page 1 of 2 1 2 Next > goodtyneguy Member. Felt the radiator in the bedroom and it was red hot. I have a recently installed oil fired burnham steam boiler. Worcester green star boiler 42cdi boiler is running the stand alone circulating pump constantly, and the pump is very hot! Central heating boiler pump running continuously. … There are three circulating pumps attached to the boiler. Everything seems to work ok when I require either DHW or CH but the pump will continue to run constantly after the event. Piping is traditional pri/sec except I have a buffer tank piped in as the pri/sec connection. Worcester Bosch Cdi Boiler Pump Running Constantly. I have a Well-McLain Series 3 P-D--7 boiler that I believe to be original to the house which was building in 1968. I've moved into a new flat that has a vaillant boiler. Source(s): condensate pump continuously running: https://shortly.im/c4cAt. Get a fixed price for a new Worcester Bosch online. Boiler on no demand: Pump over run faulty. We only put it on for an hour in the morning and an hour at night. Faulty pump. Any danger in doing that? 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. There is a simple explanation for this. Currently we are only putting on the hot water. pump on heating system seems to be running constantly ,boiler seems to switch off but come back on very quickly two zone valves seem to be operating as normal. Search My Stuff. Checked the programmer and both heating and hot water … Questions about central heating and boiler questions in here please. pump constantly running? Pump constantly running on Vaillant VCW GB242 EH? Had it on my own CH/HW system? Old_duffer New Member. Other that that it is all working perfectly, heating working when I need it in every room and loads of hot water. Checked the room stat (DT90E) on the landing and the temp was showing 25C set at 21C. Moderator: Moderators. ?--stuck circulator? A proper pump diagnostic needs to take place. The only way to stop the pump is to switch the whole system off. 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