18005455720
Ran into a problem that I think the board is bad but due to cost, I want to be sure. Client bought the machine used and I installed it. It produces ice but has a delay during cycles. Upon powering up and after the first harvest, the machine will enter the freeze cycle normally. After the second harvest, the machine shuts down for 3 minutes, has a click coming from a relay, and after 55 seconds the compressor and fan come to life. I changed the bin switch even though the bin LED is only off for 4 seconds during the dump time. I am thinking that the board is sending the machine into auto shut down even thought the bin switch is not off for the 7 second requirement.
I don't work on enough of these to invest in a board to prove the board bad so I need to be sure the board is caput.
Last edited by Gunslinger; 12-25-2010 at 01:19 AM. Reason: typo
Doug
18005455720
If a Ram is a Sheep, And an Ass is a Donkey, Why is a Ram in the Ass a Goose?
what do you mean by bin switch? The magnet on the side of the evaporator with 2 wires? (I think thats what you mean) or a different switch?
If not, in order for the machine to start a new cycle the bin switch magnetic field has to break by the curtain moving open, caused by the ice falling off of the evap ( a break in the magnetic field proves harvest has happened.) If harvest doesn't happen within 3.5 minutes it begins freezing again for 6 minutes, regardless of what the bridge thickness sensor is doing. When the bin switch reads a new magnetic field, it purges the remaining water in the water pan for 45 seconds and then refills while the compressor and condenser fan start again.
I have seen where the harvest happens, the ice falls off but a new cycle doesn't begin because the bin switch is dirty inside even though the LED on the board is momentarily off, the machine shuts down and waits for a certain amount of time before it begins again.
spoke with tech service today...he feels the board is the problem. I'll probably pull the board and check the capacitors on board to see if any have dried out/lost value.
thanks
Doug
I think I found the problem. The machine was slightly out of level in the front left corner. While watching the freeze cycle enter into harvest, I noticed the slab not moving evenly from the evap. The right hand curtain hinge pin was not tight in the curtain. After tightening the pin (pressed the rubber keeper tight) the curtain action was greatly improved. The slab was now dropping evenly and the cycling was continuously functioning with the machine not shutting down.
Doug
Thanks for the update! Just FYI I have seen that more than once on Manitowoc water curtains, and I put some PVC Solvent Cement on the backside of the pin and rubber boot and reassemble. Manitowoc sells a kit that comes with 2 new pins and rubber boots, but you still have to glue it in place.