I encountered a problem in my GC HS 7964E twice. The instrument was on and ready for injection, but the transfer line was hot than usual, even more than the set temp.
The actual temperature was reading ''--------'' (blank) and an error message was displayed; "High temperature alarm". It was extremely hot to the touch, and I disconnected it from the instrument and waited till it was cool, then I reconnected it.
After that, I was trying to inject my samples, no peaks appeared at all, but peaks who are supposed to be of large areas appeared but with rather smaller areas.
For example, DMSO whose area is supposed to be ''20000'' was found to be only ''300''!
All other methods that I have in my lab were tried, but all of them were of the same results.
My opinion is that there is a doubt that when the transfer line got too hot, some part melted or broken and it was plugged due to that extreme high temperature.
Please advise. Thank you for your time.