RTU supply fan sometimes starts and sometimes not. I have a diagnostic
"OA humidity sensor failure" I replaced the sensor but the diagnostic is still there after resetting. Upon startup the oa damper opens to 10%, unit goes to occupied mode, the K-2 relay on the RTM closes (Enableing the vfd) but no speed signal is coming out of it. After about 2-3 minutes I get "supply fan failure"
When it does try to start, it tries to ramp up to 60hz but before it gets there it shuts down and I get a "space pressure sensor failure". Does anyone have any ideas?
Thanks in advance