Question about Lochinvar Water Heaters

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I keep getting the word temp o/shoot when i turn on

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Means that the boiler has over heated to quickly and the delta T is too high.

POSSIBLE CAUSES
- no water in system
- proper water flow not present
- air in system
- bad sensors

Posted on May 29, 2017

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the thermostat has an upper and lower setting at which point to turn the unit off and back on
most have a 10 degree variation between off and on so that a steady temp is maintained
check to see if the lower setting can be raised closer to the 80 degrees
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We have just had our old system boiler replaced with a vaillant ecotec plus 837 and sounds like a similar working operation to ours. At first I was a little concerned,but I was told by our installer that he was told by vaillant that these very latest boilers size the system on start up for about 10 mins, then take temperature to target flow which you set boiler at. So even by setting target flow temperature very high you still get the initial sizing cycle, which ours was about 30-35c temp. These boilers seem to run biased for efficiency as after a while they modulate the boiler burner down and the radiators run more on the side of warm than really hot like the old type boilers. You also get better efficiency as at lower temperature the boiler condenses better. You will also find you get a more constant temperature in your home rather than over shoots. I was concerned at first, shame there was no info/explanation in user manual as people do need to know that this is normal operation. We are used to ours now, took a month and by the way these boilers can make a creaking noise but was told this normal expansion/ contraction but annoying when sited in bedroom cupboard. Best of luck!

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I have a white Rodgers ac thermostat and the temperature in my apartment stays on 88 no matter how low I set the temp. If I turn it off, of course it gets even hotter. This started happening when I pressed...


I'm not quite sure I understand what you have done but, make sure your compresor(outside is running and, that you don't have the thermostat set to "fan". You want the display to show "cool" and then adjust your temp. It sounds like you have the system set to fan and not cool. Provide me with a model number and I will see about getting you a manual.

Jun 04, 2011 | White Rodgers 0754-1 Electric Water Heater...

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My reliance electric hot water heater keeps shutting down. when I push the reset button it goes on and works for anywhere from 1 day to 5 weeks. Where do I look for a solution.


According to Reliance's trouble shooting guide, you may have faulty upper thermostat that is overheating, which is causing the high temp limit switch to open and shut it down. Pushing the reset switch is only a temporary solution until you find out what is causing it to shut down. Is it still under warranty? Call Reliance and find out. 1-800-365-4054

May 17, 2010 | Reliance WATER HEATER CO #9-40-DKRT 40GAL...

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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

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Water gets burning hot and trips reset on thermostat and theromast was replaced and still doing it


Is there a temp setting like hi,med,or low? That control works like a rheostat. If it is shorted it will keep the elements full powered and you will have this problem. Has the pressure relief vale gone off yet? Make sure it works so you don't have pressure damage to the plumbing . Now back to the thermostat. Try turning it all the way down. If it continues to heat, The rheostat is defective (temp control)

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