ZCR/QUAD Reflow oven problem.

According to Quad data sheet, the max process temp on a ZCR oven is 310C. I am taking a guess that the "Critical Temperature" message may be Quad's way of saying that you have entered to high of a setting. Try bringing the setpoints to something below 300C and see if the error goes away. Again, this is just a guess

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The problem was that the wiring between the overtemperature capillary thermostats had burnt away. There are eight of these, four on the bottom half and four on the top half of the heat chamber. A rubber blanking grommet covers the adjustment shaft of each thermostat. A rewire of these using ptfe wire resolved the problem. Only another few weeks of having to maintain these now as our new reflows are on order.

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