Carrier PERFORMANCETSERIES EDGER THERMIDISTATT CONTROL TP-PRH-A - Manual (Page 61)

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E5 − If Thermidistat Control cannot properly read humidity, E5 will be
displayed. Replace Thermidistat Control. If both Humidify and Dehumidify
have been set to OF, the humidity value will be shown as “−−” when viewed
from the humidity menu, but no E5 will be shown in the display.
Table 4 can be used as a troubleshooting tool for determining which outputs will
be active for a particular configuration and each operating mode.
When replacing a failed component such as an equipment control module or a
display module, the installer should replace both parts as a matched set. It is very
easy to accidentally mix an A/C or HP display with a PRH equipment control
module. When this happens, some functions appear in the setup while others do
not. This can be very confusing to troubleshoot. Verify that both parts have the
same model and serial number when troubleshooting the thermostat.