RBI DOMINATOR Series - Unit Sparks But Will Not Fire; Pilot Lights But Unit Will Not Fire; Insufficient Heating; Unit Consistently Shuts Down On Limit

Finned copper tube gas boilers & water heaters – Boiler Manual
37
TROUBLESHOOTING
SYMPTOM CHECK ACTION
7 Unit Does Not Spark 1. Incorrect spark gap or shorted ignitor lead
2. Bad ground on ame sense module
3. Low air (blocked ue/inlet) condition
4. Spark generator fault
1. Adjust ignitor rod or correct short
2. Check ground connections, adjust as
necessary
3. Check indicator board for low air indication
If condition exists, check inlet, ue,
chimney for blockage
Check combustion air/ventilation
opening in space
Check inlet air lter, clean/replace as
necessary
4. Check spark generator wiring
8 Unit Sparks But Will Not Fire 1. Low gas pressure
2. Pilot valve manual knob closed
3. Pilot wires disconnected
4. Low pilot pressure
5. Pilot valve malfunctioning
1. Check gas supply pressure, adjust as
necessary
2. Open pilot valve manual knob
3. Reconnect wires
4. Check pilot pressure, adjust as necessary
5. Replace pilot valve
9 Pilot Lights But Unit Will Not Fire 1. Bad ame sense lead from ignitor to
ame sense module
2. Manual valve(s) closed
3. Low manifold pressure
4. Main valve(s) malfunctioning
1. Check ground connections, adjust as
necessary
2. Remove upper front jacket panel, open
manual valve(s)
3. Check manifold pressure, adjust as
necessary
4. Replace main valve(s)
10 Insufcient Heating 1. Target temperature too low
2. Primary (safety high) limit set too low
1. Increase stage control target temperature
2. Increase limit setting
11 Unit Consistently Shuts Down 1. Primary (safety high) limit set to low 1. Increase limit setting On Limit
12 Bad Combustion
(High CO, Yellow Flames)
1. Insufcient air
2. Dirty inlet air lter
3. Too much air
1. Check CO, adjust blower inlet damper(s)
to increase airow
Check for plenum air leakage from lower
front jacket panel seams, repair as
necessary
2. Remove, inspect and clean inlet air lter
as necessary
3. Check CO, adjust blower inlet damper(s)
to decrease airow
13 Gas Flow Shuts Down During
Operation (Blowers Remain On)
1. Low air (blocked ue/inlet) condition 1. Check indicator board for low air
indication air indication
If condition exists, check inlet, ue,
chimney for blockage
Check combustion air/ventilation
openings in space
Check inlet air lter, clean/replace as
necessary