420 Passage CO detectors

[Kyanna]

I just spent a couple hours searching for the inline fuse in the carbon monoxide detector circuit. The manual does not seem to show the circuit in the diagrams. And, I have not been clever enough to find it. Can anyone give me a hint?

 

[JamesG161]

Are you sure it was OEM installed? My H430 has no such detector.
If it was OEM, I would check very close to the detector or adjacent to the Positive Power source.
Jim...

 

[Kyanna]

Pretty sure they are factory, but possibly not.. There are 3, forward stateroom, saloon, aft stateroom. All on same circuit. I have checked all the obvious places, main 12V bus, power panel, battery connections. I am going to have to start looking behind ceiling panels, etc.

 

[JamesG161]

There are 3, forward stateroom, saloon, aft stateroom

If one alarms, then all alarm?
If so, there is a third wire. That wire hooks them in series. That 3rd wire, may be your problem. A loose "series" wire will shut them all down too.
Jim...

 

[ice breaker]

on our 41 there is a push button reset on the main elec panel, just as there is one for the bilge pump. both circuits stay hot all the time.

 

[Kyanna]

OK. I found it bundled in the loom of wires behind the panel. Still not sure whether the detectors were original or aftermarket. I think they would have to be original to meet ABYC standards. Hiding the fuse is a little cheesy...

 

[JamesG161]

You better check all the fuses behind that panel. I had to buy 8 different replacements for back ups.
Did you find a 3rd wire?
If they are hooked in series, then there are 3 wires.
A test would be to blow smoke into one detector and if all go off then there is a third wire.
Jim...

 

[Kyanna]

No, not in series. They are parallel, but on the same circuit. All working fine now.