
Page 28BRADFORD WHITE CORP.
9.2 | Troubleshooting Guide |
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# | Symptom | Cause | Remedy |
1. | Pump not | A. No power | A. Check circuit breakers and power source. |
| operating | B. Pump defective | B. Replace. |
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| C. Incorrectly wired | C. Recheck wiring diagrams. |
2. | Pilot outage | A. Inlet gas pressure too low | A. Consult gas utility company. Inlet gas pressure to boiler |
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| should be 5.5" to 10.5" water column on natural gas. 0.0" to |
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| B. Inlet gas pressure too high causing | 13.0" on propane gas. |
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| B. Pressure should be regulated within limits shown above. | |
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| an unstable blowing pilot | C. Replace thermocouple. |
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| C. Weak or defective thermocouple | |
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| D. Damaged pilot or thermocouple | D. Replace. |
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| E. Dirty pilot | E. Blow dust or lint out of pilot. |
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| F. Plugged or undersized pilot orifice | F. Clean or replace pilot orifice. |
3. | Flame | A. Blocked flue | A. Remove blockage. |
| on | B. Pilot out of position (delayed ignition) | B. Correct pilot position. |
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| C. Blocked heat exchanger or flue | C. Clean and correct as necessary. |
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| D. Refractory tile out of place | D. Correct or replace tile as necessary. |
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| E. Altered draft diverter | E. Install |
4. | Spillage at | A. Cold chimney | A. Allow boiler to operate 5 minutes to create draft action. |
| draft hood | B. Vent pipe pitches down to chimney | B. Reinstall vent pipe to pitch up from boiler to chimney. |
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| C. Blocked chimney | C. Remove blockage. |
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| D. Draft hood altered | D. Install |
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| E. | E. Install U.L. listed vent cap. |
5. | Flame has | A. Low primary air | A. Correct manifold pressure according to rating plate. Correct |
| lazy yellow tip |
| orifice size if necessary (see parts list). Clean burner ports if |
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| dirty. Verify correct fuel type. |
6. | Not enough heat | A. Inadequate gas supply | A. Gas meter too small. Gas line from meter to boiler too small. |
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| B. Low manifold gas pressure | B. Gas pressure on boiler manifold (at normal firing rate) |
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| should be adjusted to 4.0"W.C. natural gas, 9.0"W.C. |
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| C. Boiler size inadequate | propane. |
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| C. Replace with boiler of higher input. | |
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| D. BJVS | D. Check operation and setting of |
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| to high fire. |
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7. | Pump noisy | A. Air in volute | A. Bleed air from volute. Check pump alignment. |
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| B. Worn coupling or bearings | B. Replace worn parts. |
8. | Boiler pounding | A. Too low water flow through boiler | A. Check temperature rise between inlet and outlet boiler piping. |
| or knocking |
| 15°F to 25°F temperature rise is recommended. If temperature |
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| rise is over 25°F, increase pipe size or pump capacity or |
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| locate obstruction. Check for stuck closed zone valves. |
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| Check for zone pumps not operating. Check for closed valve |
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| in system. |
9. | Boiler condensing | A. Low water temperature | A. Flue product moisture will condense at the |
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| boiler water temperature reaches the normal operating |
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| conditions. |
10. | Pump cavitates | A. Defective fill valves or pressure regulator | A. Replace. |
| or low water | B. Oversized expansion tank | B. Replace. |
| pressure at boiler | C. Expansion tank piped incorrectly | C. Repipe expansion tank to suction size of pump. |
| gauge or bubbles |
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| in system at high |
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| temperature |
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11. | Pressure relief | A. | A. Drain 2/3 of the water from the expansion tank. |
| valve opens |
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12. | Pilot is lit but main | A. Gas valve not at "on" position (BJVT) | A. Turn knob to "on" position. |
| burners will not | B. Boiler off on | B. Check for low water flow or |
| come on | C. Boiler incorrectly wired | C. On single or multiple zone systems with zone valves, room |
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| thermostat should be wired to R & W terminals. For multiple |
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| zone systems with zone pumps, thermostats for extra zones |
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| D. Boiler off on blocked vent switch | should be wired to R & A terminals. |
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| D. Remedy as in symptom #4. Reset the manual reset switch. | |
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| E. Boiler off on flame | E. Remedy as in symptom #3. Reset the manual reset switch. |
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| F. Broken wire in thermostat circuit | F. Check continuity through thermostat circuit with wires |
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| or defective thermostat | disconnected from R & W. |
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| G. BJVS | G. Check continuity and operation through |
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| control not functioning or loose contact. | operating control. |
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13. | Boiler short cycles | A. Heat anticipator in room thermostat | A. Increase setting (0.8 - 1.0 is usually satisfactory). |
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| set too low | B. Increase size of pump or increase piping size. |
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| B. Low water flow through boiler | |
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| C. | C. Increase setting to at least 20°F over outlet water temperature. |
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Table 8. Troubleshooting Guide.