TROUBLE SHOOTING
PROBLEM | CAUSE | SOLUTION |
When thermostat is turned on nothing happens.
Thermostat in on position causes relay and pump to operate, but heater does not fire.
Continuous shut down of low water cut off.
IID Pilot is not lit….…………………….
No power to the heater………………….
BadTrans- former…………………………
Inoperative thermostat…………………
Inoperative toggle switch………………
Inoperative relay…………………………
"A" valve closed…………………………
Plugged bleed line………………………
Flow switch open……………………….
Broken pump cou- pler……………………
Shut down on low water cutoff, caused by air………………………………………
Gas valve defective…………………….
Low water due to leaking………………
Air in system…………………………….
Check pilot gas line.
Check the circuit breaker, outdoor con- troller, etc., upstream of heater.
If power to Leads L1 and L2 of trans- former, but no power on 24V side, re- place.
Jumper thermostat , replace with new if heater fires.
If power to toggle switch, but not through switch, replace.
If power to relay, but not operating, re- place.
Open "A" valve.
Loosen bleed line and clean.
Low flow. Bleed air from the system. Adjust bypass valve to allow proper flow to activate the flow switch. If flow prob- lem persists due to system design,
Replace coupler. Inspect bearing as- sembly, and if frozen lubricate or re- place.
Bleed air reset button.
Check for power to gas valve. If valve has power but will not open, replace the valve.
Inspect for leakage and repair. Inspect for leakage and repair. Install an automatic air vent in top of low water cutoff.
35
