A.O. Smith Burkay HW-300, User Manual

16

TABLE 3.  CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE

Before any extensive troubleshooting, perform the following:
Ensure that:

•  Voltage (120 vac) is supplied to the boiler.
•  System control (tank temperature control, thermostat, 

etc.) is calling for boiler operation (call for heat).

•  Other contacts (switches) are closed (relay, low water 

cutoff, flow switch, coil protector, pressure switch, etc.).

•  Gas supply pressure is within the maximum and minimum 

operating ranges listed on the boiler rating plate/label.

•  Voltage (24 vac) is supplied by transformer.
•  Boiler is wired according to wiring diagram.

Note: Cross wiring the 24 volt circuit of the relay will short the 

transformer.

•  All wire terminals/connectors are firmly attached to 

valves, modules, switches, limit controls, etc.

•  For Propane (LP) models only check for possible lockout 

condition of the ignition module.

Use this checkout for Cer-Temp 80 Recovery Systems. (For hot water supply application only)

CHECKOUT SEQUENCE

SYSTEM OPERATION

CAUSE

REMEDY

CORRECT

INCORRECT

Set tank temperature 

control (thermostat) 

20°F (10°C) below tank 

water temperature.

Circulating pump and 

burner shut off.

With thermal balancer, 

pump off delay of 

approximately 2 minutes.

Pump and burner remain 

on.

Tank temperature control 

(thermostat) defective.

Replace.

System wiring is 

incorrect.

Correct wiring.

Circulating pump on.

Pump wired for 

continuous operation.

Correct wiring.

Burner on.

Gas control valve stuck 

or defective.

Correct or replace 

valve.

System wiring is 

incorrect.

Correct wiring.

Set tank temperature 

control (thermostat) 

20°F (10°C) above tank 

water temperature.

Circulating pump and 

burner on.

Circulating pump on.

High limit control set too 

low.

Replace. (If 

problem proven to 

be at this control by 

applying jumper to 

terminals.)

High limit control 

differential too wide.

System wiring is 

incorrect.

Correct wiring.

Coil protector switch has 

activated.

Remove control 

cover, depress 

reset button.

Gas control valve or 

wiring defective.

Check wiring. 

Repair or replace 

valve.

Circulating pump and 

burner off.

Power off or system 

wiring is incorrect.

Check power supply 

and wiring.

Tank temperature control 

(thermostat) defective.

Replace.

Burner on.

System wiring is 

incorrect.

Correct wiring.

Boiler outlet 

temperature exceeds 

210°F (100°C).

Circulating pump on.

Circulating pump and 

burner on.

High limit control 

defective, or set too high 

(max. should be set at 

200°F).

Replace.

Set tank temperature 

control (thermostat) 

for desired water 

temperature.

System maintains desired 

water temperature.

TROUBLESHOOTING