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HI IAM A ELECTRICIAN WORKING ON A LAAR HOT WATER BOILER WITH A STORAGE TANK THE TEMP IS SET TO 160 THE HIGH TEMP LIMIT SWITCH IS SET 200 AND THE AQUASTAT ON THE STORAGE TANK IS SET ON 120 THE BOILER COMES ON THEM WHEN IT SHUT OFF IT TRIPS THE HI LIMIT TEMP SWITCH

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I would suspect a water circulation problem, most likely air in the system, if the water can't flow it will overheat.

If the problem persists after bleeding check to make sure the pump is running

Posted on May 06, 2010

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Thermostat is not switching on boiler.


There are many ways for a hot water boiler to be controlled. One of them is to have an 'on-board' aqua-stat that cycles the boiler burners to maintain water temp set-point and the space thermostat controls only the circulating pump. There is no way of knowing if yours is set up this way, but try turning the thermostat on and off and see if the circulating pump cycles with it.

Volumns can be written on boiler control but with the limited information provided we can only guess.

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Wickes 102 combi boiler constantly loosing water pressure


It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

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this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

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Hello
Yes,more then likely its moisture from the high effenicey system of the boiler.

I have a laars boiler at work and some mornings when its cold out it looks like there is a fire, which is really only steam.

As long as your not shutting down on low water failure or loosing pressure and holding temp.This is normal.

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1 Answer

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