Raypak AVIA 264A - Troubleshooting Common Issues; Noise and Intermittent Operation; Scale, Sooting, and Slow Heating; Leaks, Gaskets, and Refractory Issues

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10. TROUBLESHOOTING
Problem Possible Cause Corrective Action
Harmonics, or whining noise Unitherm governor inoperative ................ Check movement by putting in hot water (above120°F [49°C]
or higher)
*Debris or restriction in system ............... Locate the restriction and remove. Flush system and clean
*Debris in gas line................................... Remove debris or blow out gas line
Low ow.................................................. Scale forming in heat exchanger - clean heat exchanger and
check pool pH and total alkalinity
Heater going on and o󰀨
continuously
Dirty lter ................................................ Clean or replace lter
Low water level in pool ........................... Raise water level
External bypass setting out of
adjustment .............................................. Adjust bypass
Pressure switch out of adjustment.......... Adjust pressure switch
Liming or scale forming in
exchanger
Pool water............................................... See Water Chemistry on page 5
Bypassing too much water ..................... Inspect bypass for movement, if no movement, replace
Unitherm governor not functioning ......... Replace if no movement when heated
Sooting High ow rates ........................................ Reduce by adding manual bypass valve
Adjust manual bypass valve until heater outlet water temp is
between 105°F and 120°F (40°C and 49°C)
Unitherm governor inoperative ............... Check movement by putting in hot water (above 120°F
[49°C] or higher). If no movement, replace
*Air starvation ......................................... Refer to installation instructions
*Improper venting ................................... Follow recommended installation instructions
*Insects or debris clogging burner intake
ports........................................................ Clean burners
Takes too long to heat pool or
spa
Under-sized heater ................................. Calculate heating capacity of heater
Htr. output (BTUH)
Pool gallonage x 8.33
or refer to heater sizing chart
This does not take into account heat loss due to weather
Filter not running long enough ................ Reset time clock
Dirty lter ................................................ Clean lter
Gas line or meter undersized ................. Refer to installation instructions
Leaking at heat exchanger Overacid ................................................. Replace heat exchanger and maintain proper water chemistry
Gasket brittle and leaking -
(overheated)
Heater running after pump shuts o󰀨 ....... See Pressure Switch Adjustment, See page 38.
Refractory damage ................................. Replace refractory
Sooted heater ......................................... Determine cause of sooting and correct
* Indicates symptom which usually occurs on initial start-up.
IMPORTANT NOTICE: These instructions are intended for the use of qualied personnel who are specically trained
and experienced in the installation of this type of heating equipment and related system components. Installation and
service personnel may be required by some states to be licensed. Persons not qualied shall not attempt to install this
equipment nor attempt repairs according to these instructions.
= approx. degF rise/hr