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My radiators stay hot even when I turn my thermostat right down to 0. There is still a click when I turn the thermostat temp up and down, but it makes no difference to the temperature of the rads, so I have to leave them switched off and only turn individual radiators on when the rooms cool down.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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kma836
  • 7 Answers

SOURCE: boiler overheating

the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

Posted on Oct 18, 2008

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  • 17 Answers

SOURCE: boiler shuts down repeatidly

i think you will find that instead of modulating as demand requires the boiler is overheating and then re operating after the safety thermostat has operated.
i wilud put some de scaler into the main heat exchanger circuit or add it to the radiators and let it circulate for a while.
also make sure the pump is operating properly to ensure proper water flow.

Posted on Nov 29, 2008

  • 30 Answers

SOURCE: overheating

you could have a flow problem due to sludge or scale in the boiler, it could be a pump problem as it may not be circulating enough water around the system. or it could be a faulty thermostat if it is not cutting out soon enough.
1st try turning the boiler stat down to its minimum, if it still over heats then it is probably the stat.
if you have a switch on your pump to increase the speed make sure it is on setting 3. if the pump is old then it may be time for a replacement.

Posted on Mar 30, 2009

gary1121
  • 332 Answers

SOURCE: Baxi 80 overheating on hot water circuit

thermostat on the gas valve needs to be replaced,, which you will probly have to change the hole gas vale ,, check on the parts and labor and if it is over 6 years old wheigh the diffrence between it and a new unit good luck

Posted on Jun 10, 2009

  • 54 Answers

SOURCE: Central heating on all the time!

The zone valve needs replacing.

Posted on Sep 26, 2009

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1 Answer

I have a triangle tube challenger boiler. D.W & radiant. It has a drop in temperature about 1.5 -3 min. after turning water on. In shower and in sinks. Was able to watch tank and feel water from laundry...


A lot depends on the size of the tank. And when it heats some systems only heat at night , this is ok if the system is large , on most heaters there is a thermostat on the side that can be used to set to a higher temp. the thermostat on your heater may be faulty.

Dec 04, 2014 | Water Heaters

1 Answer

Water temp stays at 160 degrees


Specific type of water heater does not show on web search.
I am guessing you have tank-type electric water heater.
Did you replace both thermostats and test elements?
Element could be cracked, thermostats can stick open, upper thermostat wired incorrectly, wire shorted.
We know that electric power to water heater is good, and circuit breaker is good.
Why is eco is not tripping? Why is TP valve is not leaking?
Copy following links for step-by-step:
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Jul 21, 2012 | Rheem Water Heaters

1 Answer

Hot water from the tank is only warm, Temp on the tank is at Hot


does the flame stay on all the time? sounds like bad gas valve/thermostat

Feb 24, 2012 | Water Heaters

1 Answer

Not getting any hot water. Pilot light and burner seem to be working properly. Went from working fine in morning to not working at all this evening.


No hot water anywhere,or just one faucet,doesn't sound right if burner is working,if its coming on then your gas valve/thermostat on front is not working properly.Can be changed,but I would turn up temp. red dial see if she fires and watch to see if she stays on.Gas valve is threaded in and can be changed,depending on warranty.Could also be dip tube is cracked or broken in half,its a tube that forces cold water to bottem of tank,if not working you'll get a real short shower because cold water is in top of tank.Tube can be replaced,its on the cold water fill side which would have to be taken apart.Thinking now its your tube

Jan 27, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Heats up the rapidly decreases within in minutes.


Problem new or old? How long you have unit? Sounds like not enough flow to keep burner on. Tankless need at least .6 gpm to keep hot water flowing or else the burner fires then shuts fires then shuts and you get a sandwich effect...hot cold hot cold. If you have new diverter valve in shower -vs- old two handle type try turning hot water ALL the way ON and see if hot stays hot. If it does stay hot then slowly adjust to cool and see if you maintain a good MIX for proper temp. If it goes cold again try this......LOWER control pad setting to a comfortable 105 degrees (ladies) 100 degrees(men) and turn shower valve all the way to HOT. See if your temp remains consistant now and if it does then problem solved. Tankless mindset...set temp on control pad and stop trying to MIX at shower valve. Thats how these things work. Thats why I install a control pad in each bath and one in the kitchen for adjusting ash temp during dishwasher on time. ditto for wash machine. You should never need to turn on cold water if your unit is set to proper temp at controller. Hope this helps

May 17, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Very hot water then it kicks off and I have to frequently reset


Even though the water is very hot do you run out quickly? If so the problem is the 'dip tube' if not it is most likely the upper thermostat.

May 07, 2010 | RELIANCE ELECTRIC WATER HEATER

2 Answers

Test procedure for elements and thermostat


Remove upper and lower access panels
in upper access, use voltage tester to test voltage of on the uppermost terminals above the red reset button. should be ~220V between terminals (110 to ground)
If not: breaker off or bad,
If 220V proceed:
Test the two terminals immediately below this reset button should be 220V
If not: reset tripped or bad
If 220V present, proceed.
Turn off breaker to heater.

Use ohm meter or continuity tester.
test resistance across upper element terminals -should be 10 to15 ohms
check between each terminal and ground -should be open circuit .
If not replace element
Repeat for lower element.

test across lower element thermostat should be no resistance when stat turned up so it clicks on.
(To test that lower stat turns off, allow tank to heat up completely before conducting this test) Turn sta temp down so it clicks off then test across stat terminals -should be open circuit

The upper thermostat is a 3 way switch
The simplest way to test it is to turn the power back on turn the upper stat all the way up so it clicks on and use voltage tester across the UPPER element terminals, should be ~220V
Now turn the upper stat down so it clicks off- check upper element should be 0 V between upper element terminals -(Caution ! terminals will still be live 110V to ground)
The upper stat has now sent power to lower stat.
Turn lower stat up so it clicks on, check Voltage across lower element -should be ~220V turn lower stat down so clicks off, should be 0 V across lower element terminals.

NOTE If tank is completely cold the upper stat will not switch off and wont send power to lower stat.
If lower tank is cold lower stat may not click off even when turned down.
normal stat setting is 125 to 130
The hotter you you set the stat, the faster your tank corrodes.

Apr 09, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Heatslave diverter valve


clicking rads are due to pipe expansion when getting hot.
If the hot water [secondary circuit] gets hot and the boiler stays on [does not keep going on and off] even with a constant low water flow then the diverter should be ok.
there is a valve to prevent the primary circuit [central heating] [ CH] from sending water to the rads. this or its control may be at fault.
both the
Both the CH pipes to & from the boiler should have manual valves to turn off. do this then try the hot tap-full on. If the boiler goes into overheat mode and the overheat stat kicks in to turn the boiler off -- then :-
Check also the heat exchanger, it may be furred up especially if you are in a hard water area. It means taking it off and manually checking [pour water through] If you're lucky it will be just muck to be forced out with hose pipe pressure, if not a new one

Sep 06, 2009 | Water Heaters

2 Answers

Boiler shuts down repeatidly


i think you will find that instead of modulating as demand requires the boiler is overheating and then re operating after the safety thermostat has operated.
i wilud put some de scaler into the main heat exchanger circuit or add it to the radiators and let it circulate for a while.
also make sure the pump is operating properly to ensure proper water flow.

Nov 17, 2008 | Water Heaters

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