22
TROUBLEShOOTING
Before troubleshooting
The following pages contain trouble shooting
tables for use in diagnosing control problems.
When using these tables the following should
be kept in mind:
1.
This information is only meant to be used by
a professional heating technician as an aid
in diagnosing boiler problems.
2.
Where applicable, follow all precautions
outlined in the Section 10 "Perform Startup
Checks and Adjustments" on page 17.
3
. In general, these tables assume that
there are no loose or miswired electrical
connections. Before using these tables
inspect all electrical connections on the
boiler to make sure that they are tight. Also,
check the wiring on the boiler against the
wiring diagram in Figures IW1 and IW2.
Ensure that incoming 120 Vac power polarity
is correct and that the boiler is properly
grounded. Further, ensure that the control
power supply is 24 VAC (minimum 18 VAC
to maximum 30 VAC) and polarity is correct.
4.
All controls on the boiler are tested at least
once in the manufacturing process and a
defective control or component is generally
the least likely cause. Before replacing a
component, try to rule out all other possible
causes.
5.
When checking voltage across wiring
harness pins be careful not to insert
the meter probes into the pins. Doing
so may damage the pin, resulting in a
loose connection when the harness is
reconnected.
When
Err
(error) is shown:
Value
Description
4
Flame current lower than threshold
6
Flame Out of Normal Sequence
18
Electronics Failure
23
Flame Sensed During Pre-purge
32
Temperature Sensor Failure
55
Damper Failed to Open
56
Damper Failed to Close
57
Flame Rod Shorted to Ground
58
AC Line Frequency
59
Line Voltage Error
60
Thermostat input higher than threshold
61
Line Voltage Unstable
63
Soft Lockout – Recycles Exceeded
64
Soft Lockout – Internal Failure
Possible
STA
(status) values:
Value
Description
1
Standby
4
Pre-purge
6
Spark
7
Flame Proving
8
Running
10
Retry/Recycle Delay
13
Soft Lockout
14
Hard Lockout
15
Waiting for Limit to Close
16
Flame Present Out of Sequence
17
Self Test
18
Waiting for Damper to Open
19
Watinig for Damper to Close
20
Damper Failure to Open
21
Damper Failure to Close
Press “I” key on the control to change
from one parameter to the next. Each
setting will alternate between display
code (for example
STA
) and value.
