Troubleshooting
Error 52/62
Gas valve failure. The gas valve does not open after 5 startup
attempts (timeout 20 sec.)
1 Go to the test menu. Perform the
startup sequence.
Check that the controller receives
feedback from the pressure switch and
Check that the relays are working
4 Check the Dungs control
box. (See Appendix I:
Identifying Gas-air Units and Coil on
page 66)
Error 53/63
Fan RPM. The pressure switch is active at start (timeout 20 sec.)
50 SERVICE MANUAL