Coates 6ILS, Installation, Operation And Maintenance Manual, Page: 5 / 6

WARNING:
Only qualified personnel should attempt maintenance on this equipment. (NEC Article 100)
HEATER TROUBLE SHOOTING GUIDE
- CAUTION -
This heater incorporates 240 volt electrical circuits.
Do not open the case unless unit is disconnected from electrical power.
Use only manufacturer's parts, or UL listing and warranty may be void.
Elements can be checked with an Ohm meter only when power is disconnected from heater and all wires have
been removed from the element terminals. Each element should read approximately 10.5 Ohms.
Ambient temperatures above 120°F will cause the high temperature limit to trip prematurely.
Proper water balance is important to extending the life of your Coates
Heater. While pH control is critical, the control of alkalinity and calcium
hardness will protect against scaling and also help to prevent corrosion.
ACID ALKALINE
HEATER
CAN BE
DAMAGED
CORROSIVE
WATER
IDEAL
RANGE
ALKALINE
WATER
0 1 2 3 4 5 6 7 7.2-7.8 8 9 10 11 12 13 14
HEATER
CAN BE
DAMAGED
The correct level of sanitizer, pH, total alkalinity and calcium hardness will very, depending
on the type of pool (plaster, fiberglass or vinyl) and the chemical content of the fill water.
Water that is out of balance can damage your pool heater and void the warranty. This
heater is not for use in salt water pools.
PROTECTING YOUR COATES HEATER
WITH PROPER WATER CHEMISTRY
PROBLEM INDICATORS POSSIBLE CAUSES ACTION
No Heat "HEAT" light OFF No Power to heater Check Circuit Breaker "ON".
Insufficient Flow/Pressure Check that pump is running and filter is clean.
Pressure Switch out of adjustment Consult this manual , Section 3.4, for adjust-
ment instructions.
Pressure Switch inoperative Use Ohm meter to check continuity across
switch while pump is running. Replace Pressure
Switch if Open.
"HEAT" light ON
Heating Element inoperative Replace Element as required.
Insufficient
Heat "HEAT" light ON Heater too small for Spa Check heater sizing requirement of Spa.
High Limit
RESET Trips "HEAT" light OFF Temperature control inoperative,
water overheats in Spa. Replace Temperature Control.
Pressure Switch not turning off
heater when pump/flow stops Consult this Manual Section 3.4 for adjustment
instructions. Replace as required.
Heater subjected to high ambient
temperature (i.e. Direct sunlight) Cool Equipment room or shade heater from
sun.
High Limit switch inoperative Replace High Limit Switch
Water Temp
Greater than
setpoint "HEAT" light ON Thermostat out of calibration/
inoperative Replace thermostat.
"HEAT" light OFF
External heat source (i.e. Solar
Heating, heat from the pump, etc.) Turn off power to heater and verify problem
continues.