IBC DC 23-84 - Page 66

INSTALLATION AND OPERATION INSTRUCTIONS
5-6
DC SERIES COMBI BOILERS DC 23-84, DC 29-106, DC 33-124, DC 33-160
4 No ame signal
• Gas valve closed
• Gas supply pressure too low or drooping under load
• Gas valve or ignition unit not powered
• No or incorrect ignition gap
• Condensate drain blocked
• Check grounding of all parts
5 Poor ame signal
• Condensate drain blocked
• Gas supply pressure too low or drooping under load
• Check ignitor and ignition cable
• Check gas valve adjustment
• Check grounding of all parts of the installation
• Check combustion air supply and ue gas exhaust piping and
terminations, possible ue gas recirculation in the system
6 Flame detection fault
Replace ignition cable + ignitor
cap
• Replace ignition module
• Replace controller
8 Incorrect fan speed
• Fan rubbing on casing
• Wiring between fan and casing
• Check wiring for poor wire contact
• Replace fan
• Replace controller
27 Short in outdoor sensor
• Check wiring to outdoor sensor
• Replace outdoor sensor
29,30 Gas valve relay faulty Replace controller