34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91127US REV 5/2018
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(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 flow due to an air bubble passing through the appliance (sensed via the water flow switch), the
appliance will shut down and display a temporary fault (H1). When flow 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 flame signal (ionization) circuit
F0
18, 35 61
Additional safety open
F1
10, 11, 12, 28, 29, 72, 73
High limit switch on the back of the heat exchanger or on the
burner door is open
F2
74, 75
Wrong fan speed
F4
7, 8, 9, 39, 40, 41
No flame 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, 61, 66
Outlet sensor shorted or interrupted
E0
46, 71
Inlet sensor shorted or interrupted
E2
46,71
Too many anti-scale lockouts
E6
4, 5, 28, 29, 72, 73
Water flow switch, high limit temperature or pressure
switch has opened
H1
4, 5, 21, 22, 23, 29, 30,
42, 67, 68, 72
Parameter programmed
PP
Press reset button
Parameter programming error
PE
Program again (Com1 or Com2)
Burner control is not functioning correctly
nc
Reprogram
No communication within the Cascade control system
nc.
(with dot)
Bus cable not correctly wired or
wrong COM port
Burnt fuse
(no display)
13
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 firing
1, 42, 52
d.
Appliance is very noisy during operation
29, 66, 73
e.
Tops of radiators are insufficiently hot
5, 55
f.
Temperature of the DHW is far too hot
51, 57
g.
Fault after replacement of the burner control
60
D. HARD LOCKOUT CODES
(TABLE 7-4) ADDITIONAL COMPLAINTS FOR HARD LOCKOUTS