Advertisement
The following tables 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 Start-up and Checkout Section of the boiler installation manual.
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 10.0/10.1 or 10.2, as appropriate for the boiler model. Ensure that incoming 120 VAC power polarity is
correct and that the boiler is properly grounded.
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.
Check for 120 VAC across L1 and L2. If voltage not present turn on system power. If voltage is present check polarity. If
polarity is correct replace the control.
Use Table 14.0 to help identify and correct the cause of the problem.
If no Err Code is observed (even after repeatedly pressing I to cycle through Operation Mode), use Table 14.1 to help identify
and correct the cause of the problem.
Error
Code Meaning
1
Temperature Sensor Fault
Communication Fault
2
3
Internal electronics failure
Burner Output (B1) Fault
4
Line voltage error
5
(Supply voltage too high or low)
6
Open fuse in L7248L
User settings lost (reset to factory
7
defaults)
8
L7248L Lockout
XIV Trouble Shooting
A. If Display is Blank
B. If Control Shows Err Code
C. If Control Shows StA Code, but Other Problem Present
TABLE 14.0 - ERROR CODES
Possible Cause
•
Loose connection between sensor and control
•
Sensor wire damaged
•
Defective Sensor
•
Defective control
•
EnviraCOM wiring is shorted to ground or line voltage
•
Field wiring to external Enviracom device is incorrect.
•
AC power supply frequency problem
•
Possible internal problem with boiler control. Cycle power to the boiler and
replace control if problem persists.
•
Application of power to B1 from external source (control miswired)
•
Possible internal problem with boiler control. Cycle power to the boiler and
replace control if problem persists.
•
Power supply voltage is incorrect (should be 120VAC nominal)
•
Incorrectly wired burner primary control (See Section X).
•
Clear error by entering and exiting the Adjustment mode (and changing set-
tings back to user values as needed). Replace control if problem persists.
•
Set if Err 4 was invoked four times in a row. Check wiring and clear Lockout
by pressing all three user keys for 30 seconds.
12
Advertisement
