67
PART 11 – TROUBLESHOOTING
A. ERROR CODE
If any of the sensors detect an abnormal condition or an internal component fails during the operation of
the boiler, the display may show an error code. This code may be the result of a temporary condition, in
which case the display will revert to its normal readout when the condition is corrected, or it may be the
result of a condition that the controller has evaluated as not safe to restart the boiler. In this case, the
boiler control will be locked out, requiring the maintenance person to manually reset the control by
pressing the
S4/RESET
key for more than 1 second. Typically, if the display has a code beginning with F
followed by 2 numbers, the boiler is locked out. If the display has a 3 letter code, the fault is the result of a
temporary condition.
B. BOILER ERROR
When an error condition occurs, the controller will display an error code on the display module. These
error codes and several suggested corrective actions are included in Table 18.
C. BOILER FAULT
1. When a fault condition occurs, the controller will illuminate the red “fault” indication light and display a
fault code. The alarm output will also be activated. Most fault conditions will also cause the CH pump to
run in an attempt to cool the boiler.
2. Note the fault code and refer to Table 19 for an explanation of the fault code along with several
suggestions for corrective actions.
3. Press the reset key to clear the fault and resume operation. Be sure to observe the operation of the
unit for a period of time to assure correct operation and no recurrence of fault codes.
When servicing or replacing any components of this boiler, be certain that:
•
The gas is off.
•
All electrical power is disconnected.
When servicing or replacing components that are in direct contact with the boiler water, be certain that:
•
There is no pressure in the boiler. (Pull the release on the relief valve. Do not rely on the pressure
gauge reading.
•
The boiler water is not hot.
•
The electrical power is off.
Do not use this appliance if any part has been under water. Improper or dangerous operation may result.
Contact a qualified service technician to inspect the boiler and to repair or replace any part of the boiler
that has been under water prior to placing the boiler back in operation.
This appliance has wire function labels on all internal wiring. Observe the position of each wire before
removing it. Wiring errors may cause improper and dangerous operation. Verify operation after servicing.
Summary of Contents for Mod Con 300 HL
Page 13: ...13 Figure 2 ...
Page 31: ...31 Figure 13 ...
Page 37: ...37 J SIDEWALL VENTING DIAGRAMS Figure 16 Sidewall Venting with Tee and Coupling ...
Page 38: ...38 Figure 17 Sidewall Venting Diagrams ...
Page 39: ...39 K VERTICAL VENTING DIAGRAMS Figure 18 Two Pipe Roof Venting with Tee and Coupling ...
Page 40: ...40 Figure 19 Roof and Sidewall Venting with Stainless Steel ...
Page 44: ...44 E GAS VALVE Figure 21 ...
Page 45: ...45 Figure 22 ...
Page 55: ...55 Figure 28 Mod Con Internal Connection Diagram ...
Page 73: ...73 Figure 32 ...
Page 74: ...74 Figure 33 ...
Page 75: ...75 Figure 34 ...
Page 76: ...76 Figure 35 ...
Page 77: ...77 Figure 36 ...
Page 80: ...80 ...
Page 81: ...81 ...
Page 82: ...82 MAINTENANCE NOTES ...