29
MB Pool & spa heater
TROUBLE SHOOTING GUIDE
IMPORTANT NOTICE:
These instructions are primarily intended for the use of qualifi ed personnel specifi cally
trained and experienced in the installation of this type of heating equipment and related system components.
Installation and service personnel must be Corgi Registered. Persons not qualifi ed shall not attempt to install
this equipment nor attempt repairs according to these instructions.
All Models
MECHANICAL ( FOR QUALIFIED SERVICE PERSONNEL ONLY )
PROBLEM
CAUSE
SOLUTION
Harmonics, or whining noise. U.G. inoperative........................ Check movement by putting into hot
water (43°C or higher). If no movement,
replace.
*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
fl ow................................... Scale forming in heat exchanger - clean
heat exchanger and check pool pH and
total
alkalinity.
Heater going on and off
Dirty fi lter.................................. Backwash fi lter.
continuously.
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 on
Pool water................................. Recommended pH should be between
heat exchanger.
7.4 and 7.8 total alkalinity 100-150 PPM
maximum.
Hardness
150-400
PPM
maximum.
Sooting
High
fl ow rates.......................... Reduce by adding manual bypass valve
and adjust by putting thermometer in
header (1/4" NPT) drain opening. Set
bypass
so
thermometer
reads
between
40°C
and
43°C.
U.G. Inoperative.........................Check movement by putting in hot water
(43°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.
