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Boiler keeps tripping reset in low limet controller,aquastat,module and low limet have been changed

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When was unit replaced before or after fault? need to know

Posted on Oct 31, 2008

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Posted on Jan 02, 2017

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My boiler dosent come on i have no hot water but when i turn the heating on boiler works but still no hot water what should i do


Hot water is gravity fed through your pipes. When you turn the faucet on the water will flow through the pipes. If your hot water heater is natural gas driven relight the pilot. Same if oil fueled. If electrical, check fuse to see if it has blown or the circuit breaker has tripped. If either has tripped, replace it and if it blows again the heater has a serious failure, you might need to buy a new one. If pilot won't light on gas unit, try relighting after 5 minutes, could be a bad thermocouple.

Apr 03, 2015 | Water Water Heaters

1 Answer

What temperature is it when boiler is on no 4?


Boiler temperature is usually controlled by a thermostat or aquastat. Maybe number 4 is firing rate?

Jan 23, 2015 | Water Heaters

1 Answer

Which contacts do I connect the boiler to? I thought it was the TT, but I am not getting any voltage on them.


Here is a link, that includes the wiring diagram:
http://www.forwardthinking.honeywell.com/related_links/water/aq2000/install/69_1974.pdf

It looks like the 'T-T' terminals match up with 'T-T' terminals on the Boiler Aquastat-- Do you see that control?-- and do you have wires between those controls.
Power to this Control Module is all the way to the left on the connector terminal board-- the ones that say:
R (1) C (2) - Power In

Also: Did you realize that this control is a modulating control-- Not just an 'On-Off' control?
This control has outdoor sensors, that modulate the temperature of the water temperature-- The warmer it is outside, the lower it sets the Hot Water Temperature-- thus saving fuel-- yet assuring that on very cold days, you still get Hot enough water to be comfortable in your occupied space.

Oct 12, 2013 | Honeywell AQ25142B Aquatrol Boiler Reset...

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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.

"
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?

Feb 02, 2013 | Water Heaters

1 Answer

Water only gets hot if the heating is also on and the tap flow is slow


Hi,

You have two totally unrelated problems there...

The aquastat is bad and is not turning on the boiler if there is no call for heat... therefore no hot water....

The low flow is because the coil is full of mineral and the water can not flow through the coil...
Get the inside of the coil acis cleaned to get rid of the mineral inside...

Also get the triple aquastat replaced and your good again...

heatman101

Dec 13, 2010 | Water Heaters

1 Answer

I want to increase the boiler temp by using the your aquastat


Warning! Can cause electrical shock! Here is the instruction manual
for L7248c
http://customer.honeywell.com/techlit/pdf/PackedLit/68-0281.pdf

Jan 12, 2009 | Water Heaters

1 Answer

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

Oct 08, 2008 | Water Heaters

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