Honeywell
Heating & Cooling Appliance Controls
Title: Functional description
S4965A3025
Doc.:
S4965A3025E20
Description Sign.
E.C.N.
Date
Rev.
First issue
M.Matiasko
01-Sep-2015
A
Page
16/22
Lockout condition codes
Lockout condition codes are all codes from 1 till 30. The meaning of the error numbers is as following:
FAULT 1
= Lockout signal after no flame and all ignition trials are expired. This error condition is stopping the boiler and to
get to the normal operation again, manual/remote reset is required. All resets are limited to 5 resets per 15 min.
FAULT 2
= False flame indication. If flame signal is measured with no heat demand currently present, error 2 is created. This
error condition also requires manual reset action.
FAULT 3
= High Limit error. If one of the two High Limit sensors detects a temperature of more than 85°C, High Limit error
will be generated.
FAULT 8
= Flame circuit error - during normal operation of the ignition controller, flame circuit is regularly checked. This
check has predictable behavior and several steps. If check fails, error 8 will be set.
FAULT
9
= Valve circuit error - during normal operation of the ignition controller, valve circuit is regularly checked. This
check has predictable behavior and several steps. If check fails, error 9 will be set.
FAULT
13
= All remote resets (communication) are limited to 5 resets per 15 min. If the limit is exceeded, error will be
generated and to reset it. Power Off/On and reset is necessary.
FAULT
21
= ADC error.
FAULT
25
= Matching error between Hup and Lup CRC codes (different software versions).
FAULT 40
= When Error input from Esys 2 signal is low. This error condition is stopping the boiler and to get to the normal
operation again, manual/remote reset is required. All resets are limited to 5 resets per 15 min.
Blocking condition codes
The boiler controller recognizes also the fault situations that can block the heat demands but do not lead to lockout condition.
When the error condition becomes resolved, error will disappear but will be also written into the history data. Blocking errors
are distinguished with codes from 30. The meaning of the code is as follow:
FAULT
22
= Low Mains voltage (less than 150 +/- 10 VAC) will trigger this error. When Mains brought back (164-176 VAC),
error is resolved in 10 seconds.
FAULT
26
= If the Reset knob is switched on for more than 2s, error 26 is set till the reset knob will be released.
6.4 - Ignition sequence
In case of valid heat demand request, ignition sequence will be started. In case of failed ignition, controller will try to re-ignite
for number of times. If no successful ignition after programmed number of retrials, flame lockout error will be indicated.