Raypak P-R185A to P-R405A, C-R185A to P-R405A, P-R185AL to P-R405AL, C-R185AL to C-R405AL, RP2100 Installation And Operating Instructions Manual page 33

ELECTRICAL ( STANDING PILOT MILLIVOLT)
If pilot burner remains lit.
Jump across both "TH"
wires on gas valves
If main burner fires,
If main burner does not
remove jumper
Jump across pressure
switch terminals
If main burner fires,
remove jumper
Clean filter
Check for adequate water
flow from filter
Replace pressure switch
If main burner fires,
remove jumper
Replace thermostat
RAYPAK POOL OR SPA HEATER
ELECTRICAL CHECK WITH MV GAS VALVE
CAUTION: For qualified service personnel only.
1. Filter must be on with adequate water flow through heater.
2. Gas valve must be "ON" position. Thermostat set higher
than pool water temperature.
3. Jumpers are for temporary check only. If left in place,
they could cause the heater to burn up.
Light pilot
fire, remove jumper
If main burner does not
fire, remove jumper
Jump across thermostat
If main burner does
NOT fire...
Jump across each high
limit and remove jumper
Replace high limit that
caused heater to fire
If pilot burner goes out
when main burner lights
or when gas valve knob
is released
Remove both "TH"
Replace
wires from gas valve.
gas
Relight pilot
valve
If pilot burner stays on
Problem is a wire or
component short to
cabinet or low gas
pressure
If below 500mV, check
gas pressure. Also check
for insects or debris in
the pilot burner
If output is still low,
replace pilot generator.
33
If pilot burner
does not light
Check gas supply, gas
line size, gas pressure.
Also check for insects
or debris in pilot output.
If burner does not remain
lit, attach millivolt meter
and read pilot output.
If above 500mV,
replace gas valve