Did you ever find the issue? I am having same issue and just followed the above advice but am finding they are almost same temp. 230 and 228.
More than likely there is an issue with one of the temp sensors. you will need to press and hold clear then upper on off at the same time then release them then immed. press clear 3 times and hold on the 3rd till the service screen appears. on the right side you will see internal temp and catalyst temp they should be equal or very close. ill bet one of them is alot higher than the other if so the sensor will need replace but depends which one is bad as there are 2 of them. if the problem is on the lower just repeat above but use lower instead of upper
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