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The crackling noises is just from air in the water and should be of no concern. If you are having a problem of heating up the water with the unit it is most likely do to water moving too fast through the lines. Ideally, there should be a shutoff valve installed on both sides of your heater (makes for easy removal if it needs to be serviced). But if you turn off the valve about 1/4 to 1/2 way on the one on the "in" side of the heater (where the cold water enters) then you will slow down the water going through the heater and this will give the water a better chance to heat up. This should alleviate the heating problems you are having. If you do have a shutoff valve on the cold (in) side of the heater, shut it off about 1/4 to 1/2 way and then go to your shower and turn the hot on all the way (no cold). Wait for the water to warm and test the water by hand to see if it is the temp you want. If it is still not warm enough, turn the hot on the shower DOWN just a little. This will actually make the water hotter. I know this doesnt seem right but it will. On the other hand, if the water coming out with the hot water fully turned on is too hot, then just turn on a little cold water at a time until the water is the temp you want. Remember, always give the water plenty of time to get from the heater to the shower before you decideof its the right temp. Ideally, you should be able to turn the hot water on all the way and get the hot temp that you want and if you want to cool it down, just turn the cold on just a little bit until it is where you want. I'm fairly sure the problems you are having are due to the water going too fast through the unit and once you adjust that and understand better how these tankless heaters work, you wont have any more trouble. They are difficult to get used to after using conventional water heaters and the manufacturers arent very good about giving you these hints so they will work properly. You will need a professional to uninstall and hopefully this will work and you want have to. But if you do, it requires shutting off the water to the unit. Shutting off the pwer to the unit. Unattaching the water lines to the unit and then unattaching the electric lines from the junction box or wherever they are attached. The heater then can be removed from the wall by unscrewing the screws from the hangers which hold it to the wall.
Some circulation pumps have a 3 phase mixing valve (cold,warm,hot) to regulate the water pressure in the building; no way to know unless you trace the plumbing. Basically, the hot water temperature could be lost because the circ-pump is cooling it with the cold water supplied to it. This is used to balance the pressure (aka Pressure Balancing Circ-Pump), so heater is really working overtime to heat the water. If the pump has two in and one out that's more than likely your problem; but you should consult a "old-school" plumber in your area.
Hi Jurgie, I'm Harvey, the Master Plumber, Happy to render my assistance.
This is your problem! When you are switching on the boiler it ignites for 8 to 10 seconds, then it
cuts off and the lock out lamp comes on. Pressing the reset button or
turning on the hot water tap has the same effect.
I need to get the make and model of your specific boiler to give you an accurate answer! Waiting for your response. Harvey, your Master Plumber.