The 3-1 away win increased the points gap on the relegation zone and leaves the side within one win of 14th place with a game in hand.
Matt Loaring opened the scoring on five minutes, pouncing on a spilled cross.
The game was level on 26 minutes when Scott Day put the ball in the top corner and that’s how things stayed until the second half.
Day went from hero to villain when he pushed Charlton Gauvain over in the box and Loaring put the spot kick away in the 52nd minute.
Less than 15 minutes later, it was 3-1 as Gauvain got on the scoresheet.
Other Isthmian South-Central results:
Chipstead 0-0 Badshot Lea, Corinthian-Casuals 1-3 Thatcham Town, Hanworth Villa 2-2 Ascot United, Hartley Wintney 1-4 Binfield, Leatherhead 4-0 Uxbridge, Metropolitan Police 0-1 Chertsey Town, Northwood 2-2 Raynes Park Vale, South Park Reigate 3-1 Southall, Westfield 1-1 Sutton Common Rovers.
ASHFORD TOWN: 13 Harry CANT; 2 Scott DAY (16 Kai ZINI, 65’); 3 Sam SESAY; 4 Sam HUMPHREYS; 5 Aaron GOODE; 6 Prince KANDOLO; 7 Kingsley ESHUN; 8 Jack SMITH; 9 Qasim KHAN; 10 Ben HOLDER: 11 Connor YOUNG (14 Deven REID-SOLANKI, 69’). Not used: 15 Alex STINGELIN; 17 Jack ARNOLD.
Booked: Day, Humphreys, Holder.
GUERNSEY: 1 Josh ADDISON; 2 Ben SOLWAY; 3 Jamie DODD (c); 4 Dave MERRIS; 5 Tom VAUDIN; 6 Kieran MAHON; 7 Charlton GAUVAIN; 8 Seb VANCE (12 Tom DODDS, 78’); 9 Owen WALLBRIDGE (15 Brandon WALLACE, 77’); 10 Matt LOARING; 11 Dave RIHOY (12 14 Niall HAINSWORTH, 70’).
Booked: Merris, Mahon, Gauvain.