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I have a 3 zone hot water system, and 1 zone is not working.I've tested the thermostat and it worked fine. I then adjusted the wire caps leading to the zone valve making sure the wires were not the issue.I then tought that it might be that the valve wasn't opening.While the thermostat is asking for heat, the valve it does open but the circulator does not run.I don't know what else to check

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Happy to assist you!
Perhaps a bad blower.

Sounds like an electronic failure you need a hands on diagnoses!
My words alone will not remedy the situation!
Do not wait to fix it next year to repair it!
The cost will be more then Bad Inflation!!!!!!!!!

You need to call service !!!!!!!!!!!!!
LET ME KNOW WHAT HAPPENS???

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Posted on Aug 29, 2008

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Posted on Jan 02, 2017

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1988 b2200 is overheating--we've changed out the lower radiator hose, thermostat, and the upper hose is fine. Why is it overheating? Radiator, heat pump, or water pump?


!st check and make sure the water is flowing in the radiator, then check
the timeing, Mazda will run hot if the timeing is rong.

Jul 19, 2012 | 1988 Mazda B2200

2 Answers

How do I wire around upper heating element until I can get an other one to replace it?


Question posted under marathon electric water heater.
Marathon is 240Volt dual element non-simultaneous water heater.
Non-simultaneous means that upper part of tank has to reach temperature before power is sent to lower thermostat and element. So if upper element is bad, then water heater has no hot water.
http://waterheatertimer.org/Replace-anode-rod.html#audibleBW

1) You need to by-pass upper element without by-passing upper thermostat.
2) You should never by-pass upper thermostat because it has ECO-reset protection.
http://waterheatertimer.org/How-water-heater-thermostats-work.html

3) Open following link for image of wiring:
http://waterheatertimer.org/images/Marathon-wiring-700.jpg
4) Take photo of your wiring in case color code is different on your specific model

5) Look at upper thermostat.
Remove yellow wire from terminal 2 on upper thermostat, and cap off temporarily.
Remove red wire from terminal 4 on upper thermostat, and move it to terminal 2 on upper thermostat.
6) For more effective operation, look at lower thermostat.
Remove black wire from lower thermostat terminal 1 and move wire to terminal 2 on lower thermostat.

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Sep 03, 2011 | Rheem MR105245 Marathon Electric Water...

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I've had my Grundfos Up1510SU7P for about 5 yrs. Recently, it started sending scalding hot water to the faucets. Could it need a new value? I've tried to find a manual for this for any...


It sounds like thermostatic operation is not working.
I cannot offer specific repair, but can offer resources

1) Grundfos service options and warranty information + local distributor of parts and service center finder:
http://www.grundfos.us/web/homeus.nsf/Webopslag/OMAT-5S7J7X

2) Terminal strip and capacitor replacement does not show UP1510SU
http://www.us.grundfos.com/Web/Download.nsf/Pages/F3A9576228BA79AF0825691A006D2D0F/$File/Luptl028.pdf

3) Open following link for recirculation system resources including some manuals, but I don't have your exact manual.
http://waterheatertimer.org/Water-heater-recirculation-system.html
I can see your product on following link
http://www.houseneeds.com/shop/plumbing/recirculators/waterrecirculatorindex.asp

4) Recirculation systems operate 2 ways: with thermostat or timer.
Thermostat is supposed to turn off circulation when water reaches 100 degrees approx.
Until thermostat is repaired, you can work around problem by moving slide switch to TIMER and set timer to run intermittently so temperature at faucet is moderated.

5) Adjust temperature at water heater
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html

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For a price, expert works with you while you work on timer or any do-it-yourself project.
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Jun 01, 2011 | Grundfos UP15-10B5/ATLC 1/25 HP ...

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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

1 Answer

I have a Weil-McLain hot water boiler for baseboard heat. The system has one circulator pump. The system has 5 zones - 3 work fine and two are not working. All the zone valves and thermostats are...


Hello.Prob#1 valve has a bad END SWITCH,change the power head,thad brings the circ on when open.Prob#2 try manual overide lever.iS IT TIGHT OR SMOOTH?DOES IT JUMP/SNAP?motor very hot? all bad signs.Change that power head too.The transformers are OK because 1 trans can only run 3 valves max.

Sep 20, 2010 | Honeywell (CT62B1015) Baseboard Heater

1 Answer

I have a red and a white wire but the heater wont


It sounds like you have at least 2 zones in your system. If this is a normal hot water boiler system with zone valves. When you have your thermostat call for heat it closes the 24 volt circuit that then energizes the motorized zone valve for that thermostat. In that motorized zone valve there is an end switch that will close and complete the circuit to the boiler. Zone valves when they start to clog up with mineralization will not allow the motor to go far enough to close the end switch, so then the boiler and circulating pump will not come on. If this is the case then you need to have the zone valve replaced.
Also make sure your wires at the thermostat are connected correctly. One thing you could also check at the thermostat to make sure it works or not is to jumper the 2 wires and see if your system starts up or not. If the system starts up then the thermostat or its subbase is defective. Hope I was of help to you!! Good luck!!

Nov 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

St6400c thermostat wont run the central heating independantly


This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.

Nov 05, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Need to wire a honeywell RTH7400D thermostat to 3 wire hot water


Just mark the old wires on the old thermnostat...R , W etc...and put them on the same terminals on the new 1.....also there should be some adjustment ire : switch on the back or under the cover to adjust for Hot water heating or electric heat...either is the setting you should have it on....also you shouldn't setback the thermostat at night or when away very much....2 degrees is fine , as the boiler will run along time to raise the temperature in the morning and may not get there by the set time

Oct 18, 2009 | Honeywell Electronic Programmable...

1 Answer

Zone valve on my Burnham gas furnace keeps running hot continually. How do I manually shut it off? All wires look good and are connected. The other 2 zones work fine.


ASSUMING THAT YOU HAVE HOT WATER SYSTEM,IT IS TIME TO THINK ABOUT REPLACING THE ZONE VALVE.IF YOU DISCONNECT THE ZONE VALVE,THAT AREA WILL NOT GET
ANY HEAT.IF YOU CAN GET THROUGH REST OF THE HEATING SEASON WITHOUT IT,TURN OFF THE POWER TO THE ENTIRE SYSTEM.THEN DISCONNECT THE POWER SUPPLY TO JUST THAT VALVE.BE CAREFUL TO PUT WIRE NUTS ON ANY EXPOSED BARE WIRES.YOU CAN THEN RESTORE POWER TO THE MAIN SYSTEM.

Mar 07, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

One zone not working; another is partly working


i would check my water pressure on boiler sounds like lack of pressure or air in system they can be related. if you have bleeder on baseboard try to bleed.

Feb 20, 2009 | Honeywell Programmable Thermostat Heater

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