Rheem 136-1826 - Manual (Page 35)

PROBLEM
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.
CAUSE
IID Pilot is not lit….…………………….
No power to the heater………………….
Bad Trans-
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…………………………….
SOLUTION
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,
primary-secondary pumping should be
considered.
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.
TROUBLE SHOOTING
35