34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax 734.419.0209 • www.hamiltonengineering.com • LIT91127 REV 3/09
SERVICING
(TABLE 7-3) REFERENCE OF SOLUTIONS FOR HARD LOCKOUT CODES
IN MANY CASES, A “HARD LOCKOUT” WILL INDICATE THAT THERE IS SOMETHING WRONG WITH
THE APPLIANCE, THAT SHOULD BE SERVICED OR REPAIRED.
EXAMPLE:
If there is a loss of ow due to an air bubble passing through the appliance (sensed via the water ow switch), the
appliance will shut down and display a temporary fault (H1). When ow resumes and the reset button pushed,
the control board will perform a pre-start diagnostic and then resume a burn cycle.
MEANING OF LOCKOUT
DISPLAY
CODE
POSSIBLE CAUSE
OF LOCKOUT
Short circuit in ame signal (ionization) circuit F0 18, 35 61
Water ow switch, high limit temperature or pressure switch
has opened
H1 4, 5, 21, 22, 23, 29, 30, 42, 67, 68
Wrong fan speed F4 7, 8, 9, 13, 39, 40, 41
No ame after 4 ignition attempts F5 10, 11, 12, 16, 18, 25, 35
Flame lost (4 times) during a single burn cycle F6 10, 12, 16, 22, 25, 26, 44
Outlet sensor shorted or interrupted E0 46, 71
Inlet sensor shorted or interrupted E2 46,71
External sensor shorted or interrupted E5 46, 51, 55, 63
Too many anti-scale lockouts E6 4, 5, 28, 29, 72, 73
Parameter programmed PP Press reset button
Parameter programmed incorrectly PE Program one more (Com1 or Com2)
Burner control is not functioning correctly Nc Press reset button
No communication within the Cascade control system
nc.
(with dot)
Bus cable not correctly wired or
wrong COM port
(TABLE 7-4) ADDITIONAL COMPLAINTS FOR HARD LOCKOUTS
Beside the above lockouts, there are several faults or complaints the display is unable to convey.
COMPLAINT CAUSE OF FAULT
a. The building is not warming up or water is not getting hot, but appliance is working 31, 45, 53, 54
b. Noisy ignition 16, 35
c. Room thermostat or external thermostat demanding heat, but appliance is not ring 1, 42, 52
d. Appliance is very noisy during operation 29, 46, 66
e. Tops of radiators are insufciently hot 5, 55
f. Temperature of the DHW is far too hot 51, 57
g. Fault after replacement of the burner control 60
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