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Author Topic: iBoost wont turn off!  (Read 416 times)
Miked2714
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« on: May 14, 2018, 08:42:03 PM »


We've had an iBoost for just over two years, and it has worked flawlessly until last week. It is now refusing to modulate itself and just heats the HW immersion element regardless of how much electricity is being generated by solar. This results in it drawing on the grid. My suspicion is that it's running at maximum (3kW) regardless as I can hear the immersion element "kettling" (and I can see on my energy monitor what we're drawing from the grid) BUT it's generally reporting on the LCD that it's "off".

The wireless connection to the sender / clamp unit in the meter box is fine so far as I know, it's certainly not saying it's lost contact.

I've turned off the master switch between iBoost and immersion for now.

Any ideas.? Installer not much use unfortunately. They prompted the iBoost as it was apparently more reliable than the other well known brand. I will go back to Marlec, but I just wondered if anyone had encountered this problem before, or am I missing something.
thanks
Mike
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sunandwindy
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« Reply #1 on: May 15, 2018, 12:48:53 PM »

I'd be interested to hear what Marlec have to say as mine does the same/similar and a friend who has the same also does it. I've not really stopped to examine it closely.

'ours' must be about four years or more since install.
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Miked2714
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« Reply #2 on: May 16, 2018, 08:09:35 AM »

Thanks, at least I'm not the only one. Do you just switch on your immersion manually now when its sunny?

I might try an inquiry via their facebook page.
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TheFairway
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« Reply #3 on: May 16, 2018, 09:54:35 AM »

I don't think this is the case as you say that it is drawing from the grid and you hear kettling, but will just mention it incase anyone else stumbles upon this with a similar issue.

With some immersion controllers that have a neon indicator, this will still glow even though the comtroller effectively says that it is 'off'. Not sure of the reason, but suspect some imperfect 'off' condition in the controller or capacitance inducing a tiny voltage enough for the neon to glow but not enough to create any measurable or usable current.

So just because the neon indicator is on, doesn't necessarily mean that the immersion is heating.
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sunandwindy
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« Reply #4 on: May 16, 2018, 10:05:40 AM »

So just because the neon indicator is on, doesn't necessarily mean that the immersion is heating.
In my case I haven't looked at the neon on the spur switch, it was the rumbling in the tank I was going by.
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Antman
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« Reply #5 on: May 16, 2018, 07:24:11 PM »

Mike
I am not familiar with the innards of the iBoost but it sounds like the SSR (solid state relay) - assuming that is what they have used - has failed short circuit. That would give the symptoms you describe.
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Antman
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offthegridandy
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« Reply #6 on: May 16, 2018, 08:16:27 PM »

Doesn't the thermostat in the immersion turn the power off when the set temperature is achieved?
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Dave Fowler
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« Reply #7 on: May 16, 2018, 09:27:03 PM »

Mike
I am not familiar with the innards of the iBoost but it sounds like the SSR (solid state relay) - assuming that is what they have used - has failed short circuit. That would give the symptoms you describe.
Regards
Antman
It wouldn't be an SSR (on/off device) but a proportional controller like the PAC2 from United Automation.  I'd agree in the theory that the output appears to have gone permanently 'on'.
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Tinbum
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« Reply #8 on: May 17, 2018, 09:22:45 AM »

I don't think this is the case as you say that it is drawing from the grid and you hear kettling, but will just mention it incase anyone else stumbles upon this with a similar issue.

With some immersion controllers that have a neon indicator, this will still glow even though the comtroller effectively says that it is 'off'. Not sure of the reason, but suspect some imperfect 'off' condition in the controller or capacitance inducing a tiny voltage enough for the neon to glow but not enough to create any measurable or usable current.

So just because the neon indicator is on, doesn't necessarily mean that the immersion is heating.

The neon would only come on if the immersion controller is diverting to the tank or the tank is up to temperature and the thermostat has cut in. It wont be on if the immersion controller is not diverting and the tank is below temp.

It's due to a slight 'leak' though the SSR /triac when in the off state. A high resistance resistor from the output of the SSR to neutral is enough to stop it.
« Last Edit: May 17, 2018, 09:25:23 AM by Tinbum » Logged

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