Finned copper tube gas boilers & water heaters – Boiler Manual
34
TROUBLE-SHOOTING
SYMPTOM
CHECK
ACTION
1
No Power To Control Circiut
1. Power not connected
2. External circuit breaker open
3. Transformer circuit breaker open
1. Wire unit to line voltage
2. Reset breaker
3. Reset breaker
2
No Action On Call For Heat
1. Primary limit or other control/interlock
open
2. Low water cutoff open
1. Reset limit or control or resolve problem
as applicable
If not resolved, check wiring and
condition of limit
2. Check circulating pump
2.
Check pump contact in control box
2.
Check LWCO wiring and condition
3
No Power To Pump
1. Pump contact not wired
2. Pump malfunctioning
3. Defective pump timer TD4
1. Wire pump contact in control box
2. Replace pump
3. Replace pump timer TD4
4
No Power to Optional Power Venter
1. Power venter not wired to external power
2. Power venter fault
1. Wire power venter as shown in
connection diagram
2. Replace power venter
5
Power Venter On, No Action From Unit
1. Power venter interlock not wired
1. Wire power venter interlock as shown in
connection diagram
6
No Power To Blower(s)
1. Blower(s) not plugged in
2. Defective blower timer TD3
3. Blower(s) malfunctioning
1. Plug in blower(s)
2. Replace blower timer TD3
3. Replace blower(s)
7
Unit Does Not Spark
1. Incorrect spark gap or shorted ignitor lead
2. Bad ground on flame sense module
3. Defective flame sense module
4. Low air (blocked flue/inlet) condition
5. Spark generator fault
6. Defective air purge timer TD1
1. Properly adjust ignitor gap or correct
short
2. Check ground connections, adjust as
necessary
3. Replace flame sense module
4. If condition exists, check inlet, flue, &
chimney for blockage
Check combustion air/ventilation
opening in space
Check inlet air filter, clean/replace as
necessary
5. Check spark generator wiring
6. Replace timer TD1
8
Unit Sparks But Will Not Fire
1. Low gas pressure
2. Pilot valve manual knob closed
3. Pilot valve not wired
4. Low pilot pressure
5. Pilot valve malfunctioning
1. Check gas supply pressure during inition
trial, adjust as necessary
2. Open pilot valve manual knob
3. Connect pilot valve wires
4. Check pilot pressure, adjust as necessary
5. Replace pilot valve
