GV90+
Common problems and solutions (continued)
Symptom | Common Causes | Possible Corrections | |
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Popping or percolating | Mineral deposits in sections due | Call qualified service technician to de- | |
noise heard in boiler | to constant use of makeup water | lime boiler, if necessary. In some cases, | |
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| deposits will be too heavy to remove with | |
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| Have qualified service technician repair | |
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| leaks to eliminate need for constant | |
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| makeup water. | |
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| Incorrect pH of boiler water | Call qualified service technician to check | |
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| pH level and correct. pH should be | |
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| maintained between 7.0 to 8.5. | |
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| Insufficient water flow through | Check all valves to and from boiler. Return | |
| boiler | to proper setting. | |
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| Confirm circulator size. | |
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Metal flakes found in vent | Contaminated combustion air | Remove any contaminating products. See | |
outlet or vent starter tee — | supply — See page 4 in this | page 4 in this manual. | |
flueway corrosion | manual. |
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Provide outside air for combustion. Have | |||
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| qualified service technician | |
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| Condensation of combustion | Have qualified service technician check | |
| gases in boiler sections | operation of mixing system. Repair/replace | |
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| if necessary. | |
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Some radiators or | Air in system | Bleed air from system through air vents in | |
baseboard units do not |
| radiators or baseboard units. | |
heat or are noisy |
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Low system pressure | Fill to correct pressure. | ||
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| Check for leaks in boiler or piping. Have | |
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| qualified service technician repair at once. |
High limit set too low
Adjust high limit to higher setting.
14 | Part number |