Installation Guide

26
C. USE STATUS LEDS TO GUIDE TROUBLESHOOTING
The control LEDs will light to indicate status. Use these LEDs to identify the boiler problem in the table below:
2. Circulator is On, But Boiler is Off
LED / Status Recommended Corrective Action
- POWER
- TSTAT/CIRC
Circulator
Pre-purge
Burner off
Circulator on
The boiler is warm and circulator is providing residual boiler heat to building:
Check boiler temperature
- The boiler will not start until boiler water temperature is 15°F less than the Setpoint
- If boiler water temperature is higher than 140° F, boiler start will be delayed until water temperature
drops below 140°F.
3. Circulator is On But Damper is Not Open
LED / Status Recommended Corrective Action
- POWER
- TSTAT/CIRC
Limit Open
Waiting for Limit to Open.
- Check Blocked Vent Switch, in the event of a blocked vent or poor draft condition, the blocked vent switch
will open interrupting power to control P4-1. The main burners will be extinguished immediately and the
circulator will remain on until the thermostat is turned off. The source of blockage must be corrected by
trained and skilled personnel from a qualied service agency before resetting switch.
Blocked Vents are caused by a collapsed chimney resulting in full or partial blockage, chimney cross
sectional area too small, height insufcient or cold chimney causing sustained poor draft. Always follow
the recommendations in Section I, Figure 1 and Section IV: Venting.
- Check Flame Rollout Switch, in the event of excessive blockage of the boiler section ue passageways
is developed the ame rollout switch will open interrupting power to control P4-1. The main burners will
be extinguished immediately and the circulator will remain on until the thermostat is turned off. If the
ame rollout switch is activated, do not attempt to place the boiler in operation. The source of the
blockage must be corrected and the identical ame rollout switch replaced by trained and skilled
personnel from a qualied service agency.
- Check External Limit.
1. Boiler and Circulator Off
LED / Status Recommended Corrective Action
- POWER
Standby
Burner off
Circulator off
The boiler has not detected a call for heat
Check that the thermostat:
- When a thermostat call for heat is detected control TSTAT/CIRC LED will be lit.
- Make sure thermostat is calling for heat and contacts (including appropriate zone controls) are closed.
Check for loose connection.
Check the DHW demand:
- When a domestic call for heat is detected control TSTAT/CIRC LED will be lit.
- Make sure the DHW aquastat contact is closed. Check for loose connection.