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No flow through danfoss thermostatic radiator valve

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This valve opens and closes according to room temp. Make sure that valve is set and operating properly. If so that radiator may be air locked and should have a bleeder valve on the top somewhere. When you open it air will come out until water, let it bleed water out for a couple of minutes. I hope this helps you.

Posted on Oct 24, 2008

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Posted on Jan 02, 2017

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2000 GMC Sierra SLE 5.3L overheating replaced the water pump, thermostat, fan clutch, & flushed radiator and its still overheating


here are 8 reasons a vehicle over heats. coolant level is low, you have a leak in cooling system, the cooling system may have trapped air inside, the radiator cooling fan is not working, radiator core has become plugged, bad thermostat, or bad water pump, or Your radiator cap needs to be replaced. Good-Day! this is mostly all problems with over heating. if it is a bad head gasket, you will see white smoke from tail pipe. thats because coolant is entering cylinders. as for the radiator cap have a parts store pressure test the cooling system, if they do it.

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My heat rises higher than the designated temperature. For example, if I set the thermostat to 60 the temperature will go up to 73. Invensys 9405


there could be a few things causing this, the first would be a bad thermostat. The second would be an improper setting of a heat anticipator on the thermostat, the third could be a stuck zone valve that is allowing heat to go in the zone as another zone is calling. Or it could be a stuck flow check also allowing hot water to flow through the zone much like a stuck zone valve.

If your thermostat is an older one with Mercury in it, replace it with a new one and dispose of properly. If the thermostat is newer, remove the cover or consult the owners manual to see if there is an adjustment that shuts off the thermostat a bit sooner to compensate for the heat that will be released from the system so you do not overshoot your setting on the thermostat. There may be either DIP switches to adjust the setting or a small pointer that slides over a small coil of wire and acts like a dimmer switch. Try adjusting and testing the system to see if it helps. Remember the original settings in case it does not help.

If you have zone valves (small boxes that allow flow of water to the zone) it may be stuck open allowing water to flow into that zone as another zone calls. You can test this by feeling the pipes at a baseboard when you know that the zone over heating is not calling for heat (turn thermostat to lowest setting). Check other zones to see if there is a call for heat in one of them. Make sure you adjust one of the other zones to force a call for heat in it, After a few minutes, feel the pipes in the zone overheating and see if the pipes are getting hot (be careful). This is the same test to check for a stuck flow check valve.

Mar 05, 2011 | Heating & Cooling

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Does the boiler thermostat control the heat of the radiators as well as the hot water temperature? Does the thermostat control the water temperature and the pump - as our pump seems to be on all the...


There should be a control called an aquastat that regulates the temperature of the boiler. The thermostat will turn on the circulator to start the flow of water through the radiators. If the water coming back from the radiators is very cold, a control will shut off the circulator until the boiler can come up to a predetermined temperature then start the flow of water again. If you have a tankless coil for domestic hot water, you now have a triple aquastat that maintains the temperature for domestic as well as the boiler temp. So yes the boiler thermostat (aquastat) does control the heat of the radiators and domestic hot water. No the pump is regulated by your house thermostat. You should take an amp draw on the boiler and componants to find out what is drawing more electricity than it should and popping your fuse.

Feb 19, 2011 | Heating & Cooling

1 Answer

Danfoss AVTB valve has stopped operating and is not passing water. Is there a method of manually opening the valve to allow water to flow until a repair is affected.


Hi, I am sure this is a n/c valve. The only way for this to happen is to remove the inner workings for water to flow. If there is no way to excess this valve, it would have to be removed, and the line reconnected with a hand full of fittings. I don't know if you are using copper, or galvanized pipe, but this is your best bet.
Shastalaker7

Feb 08, 2011 | Heating & Cooling

1 Answer

User manual for Danfoss Tp5 thermostat


SERVICEMANUALS @ COST www.mauritron.com Manuals at free download: homeappliance.manualsonline.com/manuals/.../lg_air_conditioner_product_list.html

Dec 16, 2010 | Heating & Cooling

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Radiator feels cold engine is over heating please explain how this is happening and the water comes up out of the bottle cap when it's closed


Sounds like the thermostat is stuck, not allowing hot water from the engine to flow to the radiator. Thus the engine is getting overheated and the radiator still feels cool.

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Good Morning ,I have a Westherm thermostat fitted to the central heating radiators in my home.I have read the posts concerning freeing the centre pin and understand how to free this.After freeing the...


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Nov 08, 2008 | Heating & Cooling

1 Answer

Danfoss thermostat control frozen at 20 degrees showing room temperature 25 degrees when room temperature not that hot


See the link on the Danfoss site.  This has helped me http://heating.consumers.danfoss.com/xxNewsx/5dbcb2f9-e888-4d2d-9761-7470786749c9_CNP1.html

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3 Answers

F20 error on vaillant eco28 combi boiler


F20 is a flow sensor error. Can be due to a defective sensor/ not correctly fitted, or you may have poor circulation, a big difference in flow and return temperatures, can sometimes make the boiler think it has a defective sensor, check good circulation through system, or if you have thermostatic radaiators valves on every single radiator, take 1 head off, as if you dont have a bypass fitted, it needs a radiator as a bypass circuit

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