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. Boiler on no demand: Pump over run faulty. At the end of last winter I discovered that the circulation pump was running constantly. I have a recently installed oil fired burnham steam boiler. It's entirely possible that it's had been running for the two years that we lived here. Thanks . 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. 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. If I trip the mains switch, the nosie is gone, but comes back as soon as I turn it back on. Currently we are only putting on the hot water. If it develops a fault then the hot water won’t be able to leave the boiler which could cause the unit to overheat. Checked the room stat (DT90E) on the landing and the temp was showing 25C set at 21C. Moderator: Moderators. Midwest-Esteemed. 0 0. 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. Next you say the hot water works correctly, and have you checked it isn't sending a signal back to the boiler. Had it on my own CH/HW system? 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. 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. Reaction score 10,006. 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. Woke up in the middle of the night rather hot. Can't remember now, but nc … The boiler has a weather compensating controller fitted (FW100 or Wave smart internet connected controller). All the zone valves appear to be closed. LOFT1009. Discussion in 'Plumbers' Talk' started by Old_duffer, Jan 16, 2018. Central heating boiler pump running continuously. 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. It's making a louder than normal sound as it runs, almost like sandy water/grinding noise. 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. Recently moved into ths house and have had the heating on as well as the hot water. I've recently noticed that the central heating pump (Grundfoss) is running all the time. 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. Supervisor. Old_duffer New Member. … read more. High efficiency, modern gas boilers fire at different rates depending on the load. This official sponsor may provide discounts for members. T. tipintim. 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. Sorry for all the questions and many thanks for your help so far. 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? What's New 3 12 24 72. boiler not firing up, pump seems to be running… 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. 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. 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. Recently it burnt out and was replaced under warranty. The problem is that the boiler pump seems to run continuously in the boiler (24 hours a day). The only way to stop the pump is to switch the whole system off. If the pump is running for hours on end, or constantly, there may be an issue with the system. Been through the instructions manual and online and can't seem to … Any danger in doing that? In the past, we’ve seen pumps constantly running due to: Faulty PCBs (the circuit board on the boiler). Anyone got any ideas? ?--stuck circulator? Piping is traditional pri/sec except I have a buffer tank piped in as the pri/sec connection. Search My Stuff. Generally, no. Boiler running all the time even with the programmer off. Arms . 6/26/2019 0 Comments Morning All, This topic has 25 replies, 12 voices, and was last updated 8 years ago by . 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. Felt the radiator in the bedroom and it was red hot. It got so annoying that I decided to turn the wall thermostat controls to 'off' but it still does it. Lv 5. Discussion in 'Plumbers' Talk' started by goodtyneguy, Sep 8, 2010. Worcester Greenstar Cdi. Apr 10, 2017 #10 Without going back thru, could it be the heads gone on one of the valves? Worcester Greenstar 25Cdi, Worcester Greenstar 27 Cdi, Worcester Greenstar 30 Cdi, Worcester Greenstar 31 Cdi. The water does get very hot even though the (new) tank thermostat is set to lowest position. There is a simple explanation for this. I tried moving the manual zone valve levers figuring maybe it was stuck a little bit but that didn't help. It's a grundfos pump working with a Potterton Suprima 30L wall mounted fan assisted balanced flue gas boiler. Pump overrun stat is faulty. 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. Other that that it is all working perfectly, heating working when I need it in every room and loads of hot water. Every unit is installed with a “set point”. boiler not firing up, pump seems to be running. Pump constantly running on Vaillant VCW GB242 EH? The boiler tripped out last night when I had it on the 24 hour setting to heat some water up. 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. We only put it on for an hour in the morning and an hour at night. 10 years ago. The PCB is faulty and telling the pump to run when it should not be running. So you can get your boiler up and running again. If there are issues with your boiler, you need a Gas Safe registered engineer to handle the repairs. Recently the circulator pump (taco) has been running constantly even though no zones are calling for heat. Furnace Running Constantly? The circulator pump on Weil-Mclain boiler keeps running. Page 1 of 2 1 2 Next > goodtyneguy Member. 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. 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 . The pump will run constantly to monitor the flow temperature and maintain heat curve. 32,405 satisfied customers. A heating engineer might be able to repair the pump but it’s most likely that a new pump … Possible causes are a faulty pump overrun thermostat or timer, or a damaged PCB (Pump Circuit Board). 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. Source(s): condensate pump continuously running: https://shortly.im/c4cAt. My Profile My Preferences My Mates. 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. All appeared to work ok for the 1st month or so of use after the boiler was put in. Worcester Bosch Cdi Boiler Pump Running Constantly. More complete answer: It depends upon how the boiler is configured. Get a fixed price for a new Worcester Bosch online. One problem that’s overlooked when it comes to overheating boilers, is the pump. Can this be a relay on the control panel in the boiler or the aquastat on my super-store hot water tank? The pump on our system keeps on running well after everything has switched off - usually all day. The mid position valve is sticking (this can be lubricated with WD40). The job of the pump is to circulate water around the central heating system. I've moved into a new flat that has a vaillant boiler. I have a recently installed oil fired burnham steam boiler. Follow our boiler circulating pump troubleshooting checklist below to find out how to fix the most common problems. Rick. Checked the programmer and both heating and hot water … Worcester green star boiler 42cdi boiler is running the stand alone circulating pump constantly, and the pump is very hot! Questions about central heating and boiler questions in here please. Faulty pump. This problem appeared to exist (at leat intermittently) on the system before the old boiler was replaced (the valves were not replaced). 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. You should also check the temperature of the water. A proper pump diagnostic needs to take place. 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