HTP 850 LPHL - Manual (Page 56)

56
LP- 205 REV. 3.28.14
Table 14
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 15.
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 16 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.