43
X. TROUBLESHOOTING
A.
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, perform startup checks and
adjustments outlined in Section VIII ‘System
Start-Up’.
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,
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.
check the wiring on the boiler against the wiring
diagram in Figures 17 and 18. 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
2
Pressure Switch Failed to Open
4
Flame current lower than threshold
6
Flame Out of Normal Sequence
18
Electronics Failure
23
Flame Sensed During Pre-purge
29
Pressure Switch Failed to Close
32
Temperature Sensor Failure
35
Duplicate Zone Alarm
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
2
Waiting for Pressure Switch to Open
3
Waiting for Pressure Switch to Close
4
Pre-purge
6
Spark
7
Flame Proving
8
Running
10
Retry/Recycle Delay
11
Pressure Switch Failed to Open
12
Pressure Switch Failed to Close
13
Soft Lockout
14
Hard Lockout
15
Waiting for Limit to Close
16
Flame Present Out of Sequence
17
Self Test
Summary of Contents for PVG3
Page 14: ...14 Figure 4 Horizontal Vent Installation III Venting continued...
Page 16: ...16 Figure 7 Attic Offset Figure 6 Vertical Vent Installation III Venting continued...
Page 29: ...29 Figure 17 Wiring Connection Diagram VI Electrical continued...
Page 31: ...31 Figure 19 Circulator Zoned System Wiring Diagram VI Electrical continued...
Page 32: ...32 Figure 20 Zone Valve Zoned System Wiring Schematic VI Electrical continued...
Page 34: ...34 Figure 21 Modular Boiler Piping VII Modular Installation continued...
Page 36: ...36 Figure 22 Operating Instructions VIII System Start up continued...
Page 51: ...51 Figure 29 Flue and Burner Cleanout 1 Burner XI Service continued...
Page 54: ...54 XII Repair Parts continued...
Page 56: ...56 XII Repair Parts continued...
Page 60: ...60 XII Repair Parts continued...
Page 67: ...67 SERVICE RECORD DATE SERVICE PERFORMED...
Page 68: ...68 U S Boiler Company Inc P O Box 3020 Lancaster PA 17604 1 888 432 8887 www usboiler net...
